Basic symbols
Let denotes all the integers model
, which can also be written as
, for example:
,
while in the cryptography world, we hope each element in an integer set should have a inverse.
Unfortunately, not every satisfy, so we introduce a new notion
.
Let denotes all the subset in
, let
, then
should have a inverse integer
which also belongs to
, we list the elements of
, and for each
, we also have
.
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