identity element ( synonym found)
Definition of identity element:

(n) : a member of a structure which, when applied to any other element via a binary operation induces an identity mapping; more specifically, given an operation *, an element I is
Definition of identity element:

(n) : a member of a structure which, when applied to any other element via a binary operation induces an identity mapping; more specifically, given an operation *, an element I is
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