Identity element

noun

Definitions

Noun
  1. 1
    An element of an algebraic structure which when applied, in either order, to any other element via a binary operation yields the other element.

    "Therefore the number 0 is not considered an identity element for subtraction, even though x-0#61;x for all x, since 0-x#92;nex."

  2. 2
    an operator that leaves unchanged the element on which it operates wordnet

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