Definitions int 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_upperDef {i...} == {j:ij }
Thm* n:. {n...}  Type

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intsetuniversememberpropimpliesandall!abstraction
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Definitions int 1 Sections StandardLIB Doc