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
bnotDef b == if b false else true fi
Thm* b:b  

About:
boolbfalsebtrueifthenelseassertmember
propfalsetrueall!abstraction
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

Definitions bool 1 Sections StandardLIB Doc