Definitions core StandardLIB Doc
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Some definitions of interest.
decidableDef Dec(P) == P  P
Thm* A:Prop. Dec(A Prop
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop

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decidablememberpropimpliesandorall!abstraction
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

Definitions core StandardLIB Doc