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Iff

From AoPSWiki

Iff is an abbreviation for the phrase "if and only if."

In order to prove a statement of the form, "p iff q," it is necessary to prove two distinct implications:

  • p implies q ("if p, then q")
  • q implies p ("if q, then p")

If a statement is an "iff" statement, then it is a biconditional statement.

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