Definitions num thy 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
int_nzeroDef  == {i:i  0 }
Thm*   Type

About:
intnatural_numbersetuniversemember
propimpliesandall!abstraction
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Definitions num thy 1 Sections StandardLIB Doc