Definitions bool 1 Sections StandardLIB Doc
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Some definitions of interest.
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop
nequalDef a  b  T == a = b  T
Thm* A:Type, x,y:A. (x  y Prop
notDef A == A  False
Thm* A:Prop. (A Prop

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universeequalmemberpropimpliesandfalseall!abstraction
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Definitions bool 1 Sections StandardLIB Doc