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Latex符号和公式

Latex符号和公式

作者: 凝聚态物理 | 来源:发表于2019-02-02 00:20 被阅读0次

1. 常用希腊字母表

Name Display Capital Case Display Var Case Display
\alpha <nobr aria-hidden="true" data-evernote-id="438" class="js-evernote-checked">α</nobr>

| | | | | |
| \beta | <nobr aria-hidden="true" data-evernote-id="460" class="js-evernote-checked">β</nobr> |

| | | | | |
| \gamma | <nobr aria-hidden="true" data-evernote-id="483" class="js-evernote-checked">γ</nobr> |

| | \Gamma | <nobr aria-hidden="true" data-evernote-id="501" class="js-evernote-checked">Γ</nobr> |

| | | |
| \theta | <nobr aria-hidden="true" data-evernote-id="521" class="js-evernote-checked">θ</nobr> |

| | \Theta | <nobr aria-hidden="true" data-evernote-id="538" class="js-evernote-checked">Θ</nobr> |

| | \vartheta | <nobr aria-hidden="true" data-evernote-id="555" class="js-evernote-checked">ϑ</nobr> |

| |
| \mu | <nobr aria-hidden="true" data-evernote-id="573" class="js-evernote-checked">μ</nobr> |

| | | | | |
| \delta | <nobr aria-hidden="true" data-evernote-id="595" class="js-evernote-checked">δ</nobr> |

| | \Delta | <nobr aria-hidden="true" data-evernote-id="613" class="js-evernote-checked">Δ</nobr> |

| | | |
| \epsilon | <nobr aria-hidden="true" data-evernote-id="633" class="js-evernote-checked">ϵ</nobr> |

| | | | \varepsilon | <nobr aria-hidden="true" data-evernote-id="652" class="js-evernote-checked">ε</nobr> |

| |
| \sigma | <nobr aria-hidden="true" data-evernote-id="670" class="js-evernote-checked">σ</nobr> |

| | \Sigma | <nobr aria-hidden="true" data-evernote-id="688" class="js-evernote-checked">Σ</nobr> |

| | \varsigma | <nobr aria-hidden="true" data-evernote-id="705" class="js-evernote-checked">ς</nobr> |

| |
| \pi | <nobr aria-hidden="true" data-evernote-id="724" class="js-evernote-checked">π</nobr> |

| | \Pi | <nobr aria-hidden="true" data-evernote-id="742" class="js-evernote-checked">Π</nobr> |

| | \varpi | <nobr aria-hidden="true" data-evernote-id="759" class="js-evernote-checked">ϖ</nobr> |

| |
| \omega | <nobr aria-hidden="true" data-evernote-id="777" class="js-evernote-checked">ω</nobr> |

| | \Omega | <nobr aria-hidden="true" data-evernote-id="794" class="js-evernote-checked">Ω</nobr> |

| | | |
| \xi | <nobr aria-hidden="true" data-evernote-id="814" class="js-evernote-checked">ξ</nobr> |

| | \Xi | <nobr aria-hidden="true" data-evernote-id="832" class="js-evernote-checked">Ξ</nobr> |

| | | |
| \zeta | <nobr aria-hidden="true" data-evernote-id="852" class="js-evernote-checked">ζ</nobr> |

| | | | | |
| \chi | <nobr aria-hidden="true" data-evernote-id="875" class="js-evernote-checked">χ</nobr> |

| | | | | |
| \rho | <nobr aria-hidden="true" data-evernote-id="897" class="js-evernote-checked">ρ</nobr> |

| | | | \varrho | <nobr aria-hidden="true" data-evernote-id="916" class="js-evernote-checked">ϱ</nobr> |

| |
| \phi | <nobr aria-hidden="true" data-evernote-id="934" class="js-evernote-checked">ϕ</nobr> |

| | \Phi | <nobr aria-hidden="true" data-evernote-id="951" class="js-evernote-checked">Φ</nobr> |

| | \varphi | <nobr aria-hidden="true" data-evernote-id="968" class="js-evernote-checked">φ</nobr> |

| |
| \eta | <nobr aria-hidden="true" data-evernote-id="986" class="js-evernote-checked">η</nobr> |

| | | | | |
| \lambda | <nobr aria-hidden="true" data-evernote-id="1009" class="js-evernote-checked">λ</nobr> |

| | \Lambda | <nobr aria-hidden="true" data-evernote-id="1026" class="js-evernote-checked">Λ</nobr> |

| | | |
| \kappa | <nobr aria-hidden="true" data-evernote-id="1046" class="js-evernote-checked">κ</nobr> |

| | | | | |
| \nu | <nobr aria-hidden="true" data-evernote-id="1068" class="js-evernote-checked">ν</nobr> |

| | | | | |
| \upsilon | <nobr aria-hidden="true" data-evernote-id="1091" class="js-evernote-checked">υ</nobr> |

| | \Upsilon | <nobr aria-hidden="true" data-evernote-id="1108" class="js-evernote-checked">Υ</nobr> |

| | | |
| \psi | <nobr aria-hidden="true" data-evernote-id="1128" class="js-evernote-checked">ψ</nobr> |

| | \Psi | <nobr aria-hidden="true" data-evernote-id="1145" class="js-evernote-checked">Ψ</nobr> |

| | | |
| \tau | <nobr aria-hidden="true" data-evernote-id="1165" class="js-evernote-checked">τ</nobr> |

| | | | | |
| \iota | <nobr aria-hidden="true" data-evernote-id="1188" class="js-evernote-checked">ι</nobr> |

| | | | | |
| o | <nobr aria-hidden="true" data-evernote-id="1210" class="js-evernote-checked">o</nobr> |

| | | | | |

2. 常用特殊字符表

Name Display Name Display Name Display Name Display
\times <nobr aria-hidden="true" data-evernote-id="1245" class="js-evernote-checked">×</nobr>

| | \div | <nobr aria-hidden="true" data-evernote-id="1262" class="js-evernote-checked">÷</nobr> |

| | \pm | <nobr aria-hidden="true" data-evernote-id="1279" class="js-evernote-checked">±</nobr> |

| | \mp | <nobr aria-hidden="true" data-evernote-id="1296" class="js-evernote-checked">∓</nobr> |

| |
| \otimes | <nobr aria-hidden="true" data-evernote-id="1314" class="js-evernote-checked">⊗</nobr> |

| | \ominus | <nobr aria-hidden="true" data-evernote-id="1331" class="js-evernote-checked">⊖</nobr> |

| | \oplus | <nobr aria-hidden="true" data-evernote-id="1348" class="js-evernote-checked">⊕</nobr> |

| | \odot | <nobr aria-hidden="true" data-evernote-id="1365" class="js-evernote-checked">⊙</nobr> |

| |
| \oslash | <nobr aria-hidden="true" data-evernote-id="1383" class="js-evernote-checked">⊘</nobr> |

| | \triangleq | <nobr aria-hidden="true" data-evernote-id="1400" class="js-evernote-checked">≜</nobr> |

| | \ne | <nobr aria-hidden="true" data-evernote-id="1417" class="js-evernote-checked">≠</nobr> |

| | \equiv | <nobr aria-hidden="true" data-evernote-id="1434" class="js-evernote-checked">≡</nobr> |

| |
| \lt | <nobr aria-hidden="true" data-evernote-id="1452" class="js-evernote-checked"><</nobr> |

| | \gt | <nobr aria-hidden="true" data-evernote-id="1469" class="js-evernote-checked">></nobr> |

| | \le | <nobr aria-hidden="true" data-evernote-id="1486" class="js-evernote-checked">≤</nobr> |

| | \ge | <nobr aria-hidden="true" data-evernote-id="1503" class="js-evernote-checked">≥</nobr> |

| |
| \cup | <nobr aria-hidden="true" data-evernote-id="1521" class="js-evernote-checked">∪</nobr> |

| | \cap | <nobr aria-hidden="true" data-evernote-id="1538" class="js-evernote-checked">∩</nobr> |

| | \Cup | <nobr aria-hidden="true" data-evernote-id="1555" class="js-evernote-checked">⋓</nobr> |

| | \Cap | <nobr aria-hidden="true" data-evernote-id="1572" class="js-evernote-checked">⋒</nobr> |

| |
| \bigcup | <nobr aria-hidden="true" data-evernote-id="1590" class="js-evernote-checked">⋃</nobr> |

| | \bigcap | <nobr aria-hidden="true" data-evernote-id="1607" class="js-evernote-checked">⋂</nobr> |

| | \ast | <nobr aria-hidden="true" data-evernote-id="1624" class="js-evernote-checked">∗</nobr> |

| | \star | <nobr aria-hidden="true" data-evernote-id="1641" class="js-evernote-checked">⋆</nobr> |

| |
| \bigotimes | <nobr aria-hidden="true" data-evernote-id="1659" class="js-evernote-checked">⨂</nobr> |

| | \bigoplus | <nobr aria-hidden="true" data-evernote-id="1676" class="js-evernote-checked">⨁</nobr> |

| | \circ | <nobr aria-hidden="true" data-evernote-id="1693" class="js-evernote-checked">∘</nobr> |

| | \bullet | <nobr aria-hidden="true" data-evernote-id="1710" class="js-evernote-checked">∙</nobr> |

| |
| \bigcirc | <nobr aria-hidden="true" data-evernote-id="1728" class="js-evernote-checked">◯</nobr> |

| | \amalg | <nobr aria-hidden="true" data-evernote-id="1745" class="js-evernote-checked">⨿</nobr> |

| | \to | <nobr aria-hidden="true" data-evernote-id="1762" class="js-evernote-checked">→</nobr> |

| | \infty | <nobr aria-hidden="true" data-evernote-id="1779" class="js-evernote-checked">∞</nobr> |

| |
| \vee | <nobr aria-hidden="true" data-evernote-id="1797" class="js-evernote-checked">∨</nobr> |

| | \wedge | <nobr aria-hidden="true" data-evernote-id="1814" class="js-evernote-checked">∧</nobr> |

| | \lhd | <nobr aria-hidden="true" data-evernote-id="1831" class="js-evernote-checked">⊲</nobr> |

| | \rhd | <nobr aria-hidden="true" data-evernote-id="1848" class="js-evernote-checked">⊳</nobr> |

| |
| \bigvee | <nobr aria-hidden="true" data-evernote-id="1866" class="js-evernote-checked">⋁</nobr> |

| | \bigwedge | <nobr aria-hidden="true" data-evernote-id="1883" class="js-evernote-checked">⋀</nobr> |

| | \unlhd | <nobr aria-hidden="true" data-evernote-id="1900" class="js-evernote-checked">⊴</nobr> |

| | \unrhd | <nobr aria-hidden="true" data-evernote-id="1917" class="js-evernote-checked">⊵</nobr> |

| |
| \sqcap | <nobr aria-hidden="true" data-evernote-id="1935" class="js-evernote-checked">⊓</nobr> |

| | \sqcup | <nobr aria-hidden="true" data-evernote-id="1952" class="js-evernote-checked">⊔</nobr> |

| | \prec | <nobr aria-hidden="true" data-evernote-id="1969" class="js-evernote-checked">≺</nobr> |

| | \succ | <nobr aria-hidden="true" data-evernote-id="1986" class="js-evernote-checked">≻</nobr> |

| |
| \subset | <nobr aria-hidden="true" data-evernote-id="2004" class="js-evernote-checked">⊂</nobr> |

| | \supset | <nobr aria-hidden="true" data-evernote-id="2021" class="js-evernote-checked">⊃</nobr> |

| | \sim | <nobr aria-hidden="true" data-evernote-id="2038" class="js-evernote-checked">∼</nobr> |

| | \approx | <nobr aria-hidden="true" data-evernote-id="2055" class="js-evernote-checked">≈</nobr> |

| |
| \subseteq | <nobr aria-hidden="true" data-evernote-id="2073" class="js-evernote-checked">⊆</nobr> |

| | \supseteq | <nobr aria-hidden="true" data-evernote-id="2090" class="js-evernote-checked">⊇</nobr> |

| | \cong | <nobr aria-hidden="true" data-evernote-id="2107" class="js-evernote-checked">≅</nobr> |

| | \doteq | <nobr aria-hidden="true" data-evernote-id="2125" class="js-evernote-checked">≐</nobr> |

| |
| \setminus | <nobr aria-hidden="true" data-evernote-id="2143" class="js-evernote-checked">∖</nobr> |

| | \mid | <nobr aria-hidden="true" data-evernote-id="2160" class="js-evernote-checked">∣</nobr> |

| | \ll | <nobr aria-hidden="true" data-evernote-id="2177" class="js-evernote-checked">≪</nobr> |

| | \gg | <nobr aria-hidden="true" data-evernote-id="2194" class="js-evernote-checked">≫</nobr> |

| |
| \parallel | <nobr aria-hidden="true" data-evernote-id="2212" class="js-evernote-checked">∥</nobr> |

| | \Join | <nobr aria-hidden="true" data-evernote-id="2229" class="js-evernote-checked">⋈</nobr> |

| | \in | <nobr aria-hidden="true" data-evernote-id="2246" class="js-evernote-checked">∈</nobr> |

| | \notin | <nobr aria-hidden="true" data-evernote-id="2263" class="js-evernote-checked">∉</nobr> |

| |
| \propto | <nobr aria-hidden="true" data-evernote-id="2281" class="js-evernote-checked">∝</nobr> |

| | \neg | <nobr aria-hidden="true" data-evernote-id="2298" class="js-evernote-checked">¬</nobr> |

| | \ldots | <nobr aria-hidden="true" data-evernote-id="2315" class="js-evernote-checked">…</nobr> |

| | \cdots | <nobr aria-hidden="true" data-evernote-id="2332" class="js-evernote-checked">⋯</nobr> |

| |
| \forall | <nobr aria-hidden="true" data-evernote-id="2350" class="js-evernote-checked">∀</nobr> |

| | \exists | <nobr aria-hidden="true" data-evernote-id="2367" class="js-evernote-checked">∃</nobr> |

| | \vdots | <nobr aria-hidden="true" data-evernote-id="2384" class="js-evernote-checked">⋮</nobr> |

| | \ddots | <nobr aria-hidden="true" data-evernote-id="2401" class="js-evernote-checked">⋱</nobr> |

| |
| \aleph | <nobr aria-hidden="true" data-evernote-id="2419" class="js-evernote-checked">ℵ</nobr> |

| | \nabla | <nobr aria-hidden="true" data-evernote-id="2436" class="js-evernote-checked">∇</nobr> |

| | \imath | <nobr aria-hidden="true" data-evernote-id="2453" class="js-evernote-checked">ı</nobr> |

| | \jmath | <nobr aria-hidden="true" data-evernote-id="2471" class="js-evernote-checked">ȷ</nobr> |

| |
| \ell | <nobr aria-hidden="true" data-evernote-id="2489" class="js-evernote-checked">ℓ</nobr> |

| | \partial | <nobr aria-hidden="true" data-evernote-id="2506" class="js-evernote-checked">∂</nobr> |

| | \int | <nobr aria-hidden="true" data-evernote-id="2524" class="js-evernote-checked">∫</nobr> |

| | \oint | <nobr aria-hidden="true" data-evernote-id="2542" class="js-evernote-checked">∮</nobr> |

| |
| \uplus | <nobr aria-hidden="true" data-evernote-id="2561" class="js-evernote-checked">⊎</nobr> |

| | \biguplus | <nobr aria-hidden="true" data-evernote-id="2578" class="js-evernote-checked">⨄</nobr> |

| | | | | |

其他

Name Display Name Display
\triangleleft <nobr aria-hidden="true" data-evernote-id="2609" class="js-evernote-checked">◃</nobr>

| | \triangleright | <nobr aria-hidden="true" data-evernote-id="2626" class="js-evernote-checked">▹</nobr> |

| |
| \bigtriangleup | <nobr aria-hidden="true" data-evernote-id="2644" class="js-evernote-checked">△</nobr> |

| | \bigtriangledown | <nobr aria-hidden="true" data-evernote-id="2661" class="js-evernote-checked">▽</nobr> |

| |
| \uparrow | <nobr aria-hidden="true" data-evernote-id="2679" class="js-evernote-checked">↑</nobr> |

| | \downarrow | <nobr aria-hidden="true" data-evernote-id="2696" class="js-evernote-checked">↓</nobr> |

| |
| \leftarrow | <nobr aria-hidden="true" data-evernote-id="2714" class="js-evernote-checked">←</nobr> |

| | \rightarrow | <nobr aria-hidden="true" data-evernote-id="2731" class="js-evernote-checked">→</nobr> |

| |
| \Leftarrow | <nobr aria-hidden="true" data-evernote-id="2749" class="js-evernote-checked">⇐</nobr> |

| | \Rightarrow | <nobr aria-hidden="true" data-evernote-id="2766" class="js-evernote-checked">⇒</nobr> |

| |
| \longleftarrow | <nobr aria-hidden="true" data-evernote-id="2784" class="js-evernote-checked">⟵</nobr> |

| | \longrightarrow | <nobr aria-hidden="true" data-evernote-id="2801" class="js-evernote-checked">⟶</nobr> |

| |
| \Longleftarrow | <nobr aria-hidden="true" data-evernote-id="2819" class="js-evernote-checked">⟸</nobr> |

| | \Longrightarrow | <nobr aria-hidden="true" data-evernote-id="2836" class="js-evernote-checked">⟹</nobr> |

| |
| \leftrightarrow | <nobr aria-hidden="true" data-evernote-id="2854" class="js-evernote-checked">↔</nobr> |

| | \longleftrightarrow | <nobr aria-hidden="true" data-evernote-id="2871" class="js-evernote-checked">⟷</nobr> |

| |
| \Leftrightarrow | <nobr aria-hidden="true" data-evernote-id="2889" class="js-evernote-checked">⇔</nobr> |

| | \Longleftrightarrow | <nobr aria-hidden="true" data-evernote-id="2906" class="js-evernote-checked">⟺</nobr> |

| |
| \leftharpoonup | <nobr aria-hidden="true" data-evernote-id="2924" class="js-evernote-checked">↼</nobr> |

| | \rightharpoonup | <nobr aria-hidden="true" data-evernote-id="2941" class="js-evernote-checked">⇀</nobr> |

| |
| \leftharpoondown | <nobr aria-hidden="true" data-evernote-id="2959" class="js-evernote-checked">↽</nobr> |

| | \rightharpoondown | <nobr aria-hidden="true" data-evernote-id="2976" class="js-evernote-checked">⇁</nobr> |

| |
| \rightleftharpoons | <nobr aria-hidden="true" data-evernote-id="2994" class="js-evernote-checked">⇌</nobr> |

| | \S | <nobr aria-hidden="true" data-evernote-id="3011" class="js-evernote-checked">§</nobr> |

| |
| \nwarrow | <nobr aria-hidden="true" data-evernote-id="3030" class="js-evernote-checked">↖</nobr> |

| | \nearrow | <nobr aria-hidden="true" data-evernote-id="3047" class="js-evernote-checked">↗</nobr> |

| |
| \swarrow | <nobr aria-hidden="true" data-evernote-id="3065" class="js-evernote-checked">↙</nobr> |

| | \searrow | <nobr aria-hidden="true" data-evernote-id="3082" class="js-evernote-checked">↘</nobr> |

| |
| \triangle | <nobr aria-hidden="true" data-evernote-id="3100" class="js-evernote-checked">△</nobr> |

| | \box | <nobr aria-hidden="true" data-evernote-id="3117" class="js-evernote-checked">□</nobr> |

| |
| \diamond | <nobr aria-hidden="true" data-evernote-id="3135" class="js-evernote-checked">⋄</nobr> |

| | \diamondsuit | <nobr aria-hidden="true" data-evernote-id="3152" class="js-evernote-checked">♢</nobr> |

| |
| \heartsuit | <nobr aria-hidden="true" data-evernote-id="3170" class="js-evernote-checked">♡</nobr> |

| | \clubsuit | <nobr aria-hidden="true" data-evernote-id="3187" class="js-evernote-checked">♣</nobr> |

| |
| \spadesuit | <nobr aria-hidden="true" data-evernote-id="3205" class="js-evernote-checked">♠</nobr> |

| | | |

3. 公式语法

  • 上下标_ ^ , _{}^{}

    <nobr aria-hidden="true" data-evernote-id="3230" class="js-evernote-checked">y=xa21i</nobr>

  • 公式中插入文本\mbox{}

    <nobr aria-hidden="true" data-evernote-id="3284" class="js-evernote-checked">y=x2(二次函数)</nobr>

    • 公式中插入空格\, \; \quad \qquad间隔依次变宽:

    <nobr aria-hidden="true" data-evernote-id="3330" class="js-evernote-checked">ab</nobr>

<nobr aria-hidden="true" data-evernote-id="3349" class="js-evernote-checked">ab</nobr>

<nobr aria-hidden="true" data-evernote-id="3370" class="js-evernote-checked">ab</nobr>

<nobr aria-hidden="true" data-evernote-id="3391" class="js-evernote-checked">ab</nobr>

<nobr aria-hidden="true" data-evernote-id="3412" class="js-evernote-checked">ab</nobr>

  • 字母上方横线\overline{}, \bar{}

    <nobr aria-hidden="true" data-evernote-id="3438" class="js-evernote-checked">xyz¯¯¯¯¯¯¯¯ 或 x¯</nobr>

    • 字母下方横线\underline{}

    <nobr aria-hidden="true" data-evernote-id="3521" class="js-evernote-checked">ABC–––––</nobr>

    • 字母上方波浪线\tilde{}, \widetilde{}

    <nobr aria-hidden="true" data-evernote-id="3568" class="js-evernote-checked">A~ 或 ABC˜</nobr>

    • 字母上方尖号^\hat{}, \widehat{}

    <nobr aria-hidden="true" data-evernote-id="3628" class="js-evernote-checked">A^ 或 ABCˆ</nobr>

    • 字母上方箭头\vec{}, \overleftarrow{}, \overrightarrow{}

    <nobr aria-hidden="true" data-evernote-id="3688" class="js-evernote-checked">ab→ 或 ab← 或 ab→</nobr>

    • 字母上方花括号\overbrace{},或下方花括号\underbrace{}

    <nobr aria-hidden="true" data-evernote-id="3769" class="js-evernote-checked">1+2+3 或 1+2+3</nobr>

    • 字母上方点号\dot{}, \ddot{}

    <nobr aria-hidden="true" data-evernote-id="3879" class="js-evernote-checked">a˙ 或 a¨</nobr>

    • 省略号\dots, \cdots

    <nobr aria-hidden="true" data-evernote-id="3932" class="js-evernote-checked">1,2,…1,2,⋯</nobr>

    • 积分\int_{}^{}

    <nobr aria-hidden="true" data-evernote-id="3974" class="js-evernote-checked">∫+∞−∞f(x)dx</nobr>

双重积分\iint

<nobr aria-hidden="true" data-evernote-id="4034" class="js-evernote-checked">∬+∞−∞f(x,y)dxdy</nobr>

行内积分:<nobr aria-hidden="true" data-evernote-id="4102" class="js-evernote-checked">∫+∞−∞f(x)dx</nobr>
行内积分limits模式\int\limits_{}^{}:<nobr aria-hidden="true" data-evernote-id="4158" class="js-evernote-checked">∫−∞+∞f(x)dx</nobr>
行内积分display模式\displaystyle \int_{}^{}:<nobr aria-hidden="true" data-evernote-id="4214" class="js-evernote-checked">∫+∞−∞f(x)dx</nobr>

圆圈积分\oint

<nobr aria-hidden="true" data-evernote-id="4277" class="js-evernote-checked">∮+∞−∞</nobr>

  • 求和\sum_{}^{}

    <nobr aria-hidden="true" data-evernote-id="4323" class="js-evernote-checked">∑i=1ni2</nobr>

行内求和:<nobr aria-hidden="true" data-evernote-id="4373" class="js-evernote-checked">∑ni=1i2</nobr>

行内求和limits模式\sum\limits_{}^{}:<nobr aria-hidden="true" data-evernote-id="4423" class="js-evernote-checked">∑i=1ni2</nobr>
行内求和display模式\displaystyle \sum_{}^{}:<nobr aria-hidden="true" data-evernote-id="4473" class="js-evernote-checked">∑i=1ni2</nobr>* 求乘积\prod_{}^{}

<nobr aria-hidden="true" data-evernote-id="4531" class="js-evernote-checked">∏i=1nai</nobr>

*   分数`\frac{up}{down}`:

<nobr aria-hidden="true" data-evernote-id="4587" class="js-evernote-checked">x1,x2=b2±4ac2a</nobr>

*   根号`\sqrt`:

<nobr aria-hidden="true" data-evernote-id="4670" class="js-evernote-checked">r=x2+y2−−−−−−√</nobr>

多次根号\sqrt[n]

<nobr aria-hidden="true" data-evernote-id="4741" class="js-evernote-checked">x2/3=x2−−√3</nobr>

编号

  • 插入编号:
    使用\tag指令指定公式的具体编号,并使用\label指令埋下锚点。如y=x^2 \tag{1.5a} \label{eq:test}

    <nobr aria-hidden="true" data-evernote-id="4820" class="js-evernote-checked">y=x2(1.5a)</nobr>

  • 引用编号:
    使用\eqref指令引用前面埋下的锚点,\eqref{eq:test}将显示为:

    <nobr aria-hidden="true" data-evernote-id="4879" class="js-evernote-checked">(1.5a)</nobr>

4. 方程组

  • 左侧花括号

    \begin{equation}
        % \begin{equation*} 加'*'去掉公式编号
        \left\{
        \begin{aligned}     %请使用'aligned'或'align*'
        2x + y &= 1  \\     %加'&'指定对齐位置
        2x + 2y &= 2
        \end{aligned}
        \right.
        \end{equation}
    % \end{equation*}   加'*'去掉公式编号
    
    % 注意:在 markdown 环境下,某些特殊字符,如'\', '*'等,会首先被 markdown 语法转义,然后再被 Latex 转义。
    % 因此有时候 '\{'需要写作'\\{','*'需要写作'\*','\\'需要写作'\\\\'等,视不同的解释环境而定
    

    <nobr aria-hidden="true" data-evernote-id="4949" class="js-evernote-checked">{2x+y2x+2y=1=2</nobr>

  • :如果各个方程需要在某个字符处对齐(如等号对齐),只需在所有要对齐的字符前加上 & 符号。如果不需要公式编号,只需在宏包名称后加上 * 号。

    • 分情况讨论方程式
    f(x) =
    \begin{cases}
        x^2 \qquad & a \gt 0 \\
        e^x \qquad & a \le 0
        \end{cases}
    

    <nobr aria-hidden="true" data-evernote-id="5063" class="js-evernote-checked">f(x)=⎧⎩⎨x2exa>0a≤0</nobr>

<nobr aria-hidden="true" data-evernote-id="5179" class="js-evernote-checked">abcd=1=2</nobr>


附:本文的 Markdown 原文

为了方便查看公式等的编写细节,附上本文的 markdown 原文。

# Markdown中Latex常用语法

## 常用希腊字母表

| Name       | Display      | Capital Case   | Display      | Var Case      | Display         |
| ---------  | :----------: | -------------- | :----------: | ------------  | :-------------: |
| `\alpha`   | $\alpha$     |                |              |               |                 |
| `\beta`    | $\beta$      |                |              |               |                 |
| `\gamma`   | $\gamma$     | `\Gamma`       | $\Gamma$     |               |                 |
| `\theta`   | $\theta$     | `\Theta`       | $\Theta$     | `\vartheta`   | $\vartheta$     |
| `\mu`      | $\mu$        |                |              |               |                 |
| `\delta`   | $\delta$     | `\Delta`       | $\Delta$     |               |                 |
| `\epsilon` | $\epsilon$   |                |              | `\varepsilon` | $\varepsilon$   |
| `\sigma`   | $\sigma$     | `\Sigma`       | $\Sigma$     | `\varsigma`   | $\varsigma$     |
| `\pi`      | $\pi$        | `\Pi`          | $\Pi$        | `\varpi`      | $\varpi$        |
| `\omega`   | $\omega$     | `\Omega`       | $\Omega$     |               |                 |
| `\xi`      | $\xi$        | `\Xi`          | $\Xi$        |               |                 |
| `\zeta`    | $\zeta$      |                |              |               |                 |
| `\chi`     | $\chi$       |                |              |               |                 |
| `\rho`     | $\rho$       |                |              | `\varrho`     | $\varrho$       |
| `\phi`     | $\phi$       | `\Phi`         | $\Phi$       | `\varphi`     | $\varphi$       |
| `\eta`     | $\eta$       |                |              |               |                 |
| `\lambda`  | $\lambda$    | `\Lambda`      | $\Lambda$    |               |                 |
| `\kappa`   | $\kappa$     |                |              |               |                 |
| `\nu`      | $\nu$        |                |              |               |                 |
| `\upsilon` | $\upsilon$   | `\Upsilon`     | $\Upsilon$   |               |                 |
| `\psi`     | $\psi$       | `\Psi`         | $\Psi$       |               |                 |
| `\tau`     | $\tau$       |                |              |               |                 |
| `\iota`    | $\iota$      |                |              |               |                 |
| `o`        | $o$          |                |              |               |                 |

## 常用特殊字符表

| Name         | Display        | Name         | Display        | Name     | Display    | Name      | Display     |
| -----------  | :------------: | -----------  | :------------: | -------  | :--------: | --------  | :---------: |
| `\times`     | $\times$       | `\div`       | $\div$         | `\pm`    | $\pm$      | `\mp`     | $\mp$       |
| `\otimes`    | $\otimes$      | `\ominus`    | $\ominus$      | `\oplus` | $\oplus$   | `\odot`   | $\odot$     |
| `\oslash`    | $\oslash$      | `\triangleq` | $\triangleq$   | `\ne`    | $\ne$      | `\equiv`  | $\equiv$    |
| `\lt`        | $\lt$          | `\gt`        | $\gt$          | `\le`    | $\le$      | `\ge`     | $\ge$       |
| `\cup`       | $\cup$         | `\cap`       | $\cap$         | `\Cup`   | $\Cup$     | `\Cap`    | $\Cap$      |
| `\bigcup`    | $\bigcup$      | `\bigcap`    | $\bigcap$      | `\ast`   | $\ast$     | `\star`   | $\star$     |
| `\bigotimes` | $\bigotimes$   | `\bigoplus`  | $\bigoplus$    | `\circ`  | $\circ$    | `\bullet` | $\bullet$   |
| `\bigcirc`   | $\bigcirc$     | `\amalg`     | $\amalg$       | `\to`    | $\to$      | `\infty`  | $\infty$    |
| `\vee`       | $\vee$         | `\wedge`     | $\wedge$       | `\lhd`   | $\lhd$     | `\rhd`    | $\rhd$      |
| `\bigvee`    | $\bigvee$      | `\bigwedge`  | $\bigwedge$    | `\unlhd` | $\unlhd$   | `\unrhd`  | $\unrhd$    |
| `\sqcap`     | $\sqcap$       | `\sqcup`     | $\sqcup$       | `\prec`  | $\prec$    | `\succ`   | $\succ$     |
| `\subset`    | $\subset$      | `\supset`    | $\supset$      | `\sim`   | $\sim$     | `\approx` | $\approx$   |
| `\subseteq`  | $\subseteq$    | `\supseteq`  | $\supseteq$    | `\cong`  | $\cong$    | `\doteq`  | $\doteq$    |
| `\setminus`  | $\setminus$    | `\mid`       | $\mid$         | `\ll`    | $\ll$      | `\gg`     | $\gg$       |
| `\parallel`  | $\parallel$    | `\Join`      | $\Join$        | `\in`    | $\in$      | `\notin`  | $\notin$    |
| `\propto`    | $\propto$      | `\neg`       | $\neg$         | `\ldots` | $\ldots$   | `\cdots`  | $\cdots$    |
| `\forall`    | $\forall$      | `\exists`    | $\exists$      | `\vdots` | $\vdots$   | `\ddots`  | $\ddots$    |
| `\aleph`     | $\aleph$       | `\nabla`     | $\nabla$       | `\imath` | $\imath$   | `\jmath`  | $\jmath$    |
| `\ell`       | $\ell$         | `\partial`   | $\partial$     | `\int`   | $\int$     | `\oint`   | $\oint$     |
| `\uplus`     | $\uplus$       | `\biguplus`  | $\biguplus$    |          |            |           |             |

### 其他

| Name                 | Display                | Name                  | Display                 |
| -------------------  | :--------------------: | --------------------  | :---------------------: |
| `\triangleleft`      | $\triangleleft$        | `\triangleright`      | $\triangleright$        |
| `\bigtriangleup`     | $\bigtriangleup$       | `\bigtriangledown`    | $\bigtriangledown$      |
| `\uparrow`           | $\uparrow$             | `\downarrow`          | $\downarrow$            |
| `\leftarrow`         | $\leftarrow$           | `\rightarrow`         | $\rightarrow$           |
| `\Leftarrow`         | $\Leftarrow$           | `\Rightarrow`         | $\Rightarrow$           |
| `\longleftarrow`     | $\longleftarrow$       | `\longrightarrow`     | $\longrightarrow$       |
| `\Longleftarrow`     | $\Longleftarrow$       | `\Longrightarrow`     | $\Longrightarrow$       |
| `\leftrightarrow`    | $\leftrightarrow$      | `\longleftrightarrow` | $\longleftrightarrow$   |
| `\Leftrightarrow`    | $\Leftrightarrow$      | `\Longleftrightarrow` | $\Longleftrightarrow$   |
| `\leftharpoonup`     | $\leftharpoonup$       | `\rightharpoonup`     | $\rightharpoonup$       |
| `\leftharpoondown`   | $\leftharpoondown$     | `\rightharpoondown`   | $\rightharpoondown$     |
| `\rightleftharpoons` | $\rightleftharpoons$   | `\S`                  | $\S$                    |
| `\nwarrow`           | $\nwarrow$             | `\nearrow`            | $\nearrow$              |
| `\swarrow`           | $\swarrow$             | `\searrow`            | $\searrow$              |
| `\triangle`          | $\triangle$            | `\box`                | $\Box$                  |
| `\diamond`           | $\diamond$             | `\diamondsuit`        | $\diamondsuit$          |
| `\heartsuit`         | $\heartsuit$           | `\clubsuit`           | $\clubsuit$             |
| `\spadesuit`         | $\spadesuit$           |                       |                         |

## 公式语法

- 上下标`_ ^ , _{}^{}`:
    $$ y = x_i^{a_1^2} $$
- 公式中插入文本`\mbox{}`:
    $$ y = x^2 \; \mbox{(二次函数)} $$
- 公式中插入空格`\,  \;  \quad  \qquad`间隔依次变宽:
    $$ ab $$ $$ a\,b $$ $$ a\;b $$ $$ a\quad b $$ $$ a\qquad b $$

- 字母上方横线`\overline{}, \bar{}`:
    $$ \overline{xyz} \mbox{ 或 } \bar{x} $$
- 字母下方横线`\underline{}`:
    $$ \underline{ABC} $$
- 字母上方波浪线`\tilde{}, \widetilde{}`:
    $$ \tilde{A} \mbox{ 或 } \widetilde{ABC} $$
- 字母上方尖号^`\hat{}, \widehat{}`:
    $$ \hat{A} \mbox{ 或 } \widehat{ABC} $$
- 字母上方箭头`\vec{}, \overleftarrow{}, \overrightarrow{}`:
    $$ \vec{ab} \mbox{ 或 } \overleftarrow{ab} \mbox{ 或 } \overrightarrow{ab} $$
- 字母上方花括号`\overbrace{}`,或下方花括号`\underbrace{}`:
    $$ \overbrace{1+2+3} \mbox{ 或 } \underbrace{1+2+3} $$
- 字母上方点号`\dot{}, \ddot{}`:
    $$ \dot{a} \mbox{ 或 } \ddot{a} $$
- 省略号`\dots, \cdots`
    $$ 1,2,\dots  \qquad  1,2,\cdots $$

- 积分`\int_{}^{}`:
    $$ \int_{-\infty}^{+\infty} f(x) \mathrm{d}x $$

    双重积分`\iint`:$$ \iint_{-\infty}^{+\infty} f(x,y) \mathrm{d}x \mathrm{d}y $$
    行内积分:$\int_{-\infty}^{+\infty} f(x) \mathrm{d}x$
    行内积分limits模式`\int\limits_{}^{}`:$\int\limits_{-\infty}^{+\infty} f(x) \mathrm{d}x$
    行内积分display模式`\displaystyle \int_{}^{}`:$\displaystyle \int_{-\infty}^{+\infty} f(x) \mathrm{d}x$

    圆圈积分`\oint`:$$ \oint_{-\infty}^{+\infty} $$

- 求和`\sum_{}^{}`:
    $$ \sum_{i=1}^{n} i^2 $$

    行内求和:$\sum_{i=1}^{n} i^2$
    行内求和limits模式`\sum\limits_{}^{}`:$\sum\limits_{i=1}^{n} i^2$
    行内求和display模式`\displaystyle \sum_{}^{}`:$\displaystyle \sum_{i=1}^{n} i^2$

- 求乘积`\prod_{}^{}`:
    $$ \prod_{i=1}^{n} a_i $$

- 分数`\frac{up}{down}`:
    $$ x_1,x_2 = \frac{b^2 \pm 4ac}{2a} $$

- 根号`\sqrt`:
    $$ r = \sqrt{x^2+y^2} $$

    多次根号`\sqrt[n]`: $$ x^{2/3} = \sqrt[3]{x^2} $$

## 编号

- 插入编号:
    使用`\tag`指令指定公式的具体编号,并使用`\label`指令埋下锚点。如`y=x^2 \tag{1.5a} \label{eq:test}`:
    $$ y=x^2 \tag{1.5a}\label{eq:test} $$

- 引用编号:
    使用`\eqref`指令引用前面埋下的锚点,`\eqref{eq:test}`将显示为:
    $$ \eqref{eq:test} $$

## 方程组

- 左侧花括号

    ```latex
    \begin{equation}
    % \begin{equation*} 加'*'去掉公式编号
    \left\{
    \begin{aligned}     %请使用'aligned'或'align*'
    2x + y &= 1  \\     %加'&'指定对齐位置
    2x + 2y &= 2
    \end{aligned}
    \right.
    \end{equation}
    % \end{equation*}   加'*'去掉公式编号

    % 注意:在 markdown 环境下,某些特殊字符,如'\', '*'等,会首先被 markdown 语法转义,然后再被 Latex 转义。
    % 因此有时候 '\{'需要写作'\\{','*'需要写作'\*','\\'需要写作'\\\\'等,视不同的解释环境而定
    ```

    $$ \begin{equation}
    \left\\{
    \begin{aligned}
    2x + y &= 1 \\\\
    2x + 2y &= 2
    \end{aligned}
    \right.
    \end{equation} $$

    **注**:如果各个方程需要在某个字符处对齐(如等号对齐),只需在所有要对齐的字符前加上 `&` 符号。如果不需要公式编号,只需在宏包名称后加上 `*` 号。

- 分情况讨论方程式

    ```latex
    f(x) =
    \begin{cases}
    x^2 \qquad & a \gt 0 \\
    e^x \qquad & a \le 0
    \end{cases}
    ```

    $$ f(x) = \begin{cases}
    x^2 \qquad & a \gt 0 \\\\
    e^x \qquad & a \le 0
    \end{cases} $$

    $$ \begin{aligned}
    a &= 1 \\\\
    bcd &= 2
    \end{aligned} $$

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      本文标题:Latex符号和公式

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