WhoCites Definitions int 2 Sections StandardLIB Doc
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Who Cites iff?
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop
rev_impliesDef P  Q == Q  P
Thm* A,B:Prop. (A  B Prop

Syntax:P  Q has structure: iff(PQ)

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memberpropimpliesandall!abstraction
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WhoCites Definitions int 2 Sections StandardLIB Doc