欧几里得（Euclid）：古希腊数学家，“几何之父”。（mathematician, geometer and logician）
欧氏空间（Euclidean space）： Euclidean space is the fundamental space of geometry, intended to represent physical space. Originally, that is, in Euclid's Elements, it was the three-dimensional space of Euclidean geometry, but in modern mathematics, there are Euclidean spaces of any positive integer dimension,[1] including the three-dimensional space and the Euclidean plane (dimension two). The qualifier "Euclidean" is used to distinguish Euclidean spaces from other spaces that were later considered in physics and modern mathematics.
欧几里得几何（Euclidean geometry）： the study of plane and solid figures on the basis of axioms and theorems employed by the Greek mathematician Euclid (c. 300 BCE).
点乘，内积，点积（dot product, scalar product）：
百科（https://baike.baidu.com/item/%E7%82%B9%E7%A7%AF/9648528?fromtitle=%E7%82%B9%E4%B9%98&fromid=8251625&fr=aladdin）
哈达玛积（Hadamard product）： In mathematics, the Hadamard product is a binary operation that takes two matrices of the same dimensions and produces another matrix of the same dimension as the operands, where each element i, j is the product of elements i, j of the original two matrices.
Hadamard product
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