Definitions num thy 1 Sections StandardLIB Doc
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Some definitions of interest.
absvalDef |i| == if 0i i else -i fi
Thm* x:. |x 
dividesDef b | a == c:a = bc
Thm* a,b:. (a | b Prop

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

Definitions num thy 1 Sections StandardLIB Doc