Definitions bool 1 Sections StandardLIB Doc
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Some definitions of interest.
assertDef b == if b True else False fi
Thm* b:b  Prop
bimpliesDef pq == p  q
Thm* p,q:pq  
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop

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boolifthenelseassertmemberpropimplies
andfalsetrueall!abstraction
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Definitions bool 1 Sections StandardLIB Doc