Definitions int 2 Sections 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
int_segDef {i..j} == {k:i  k < j }
Thm* m,n:. {m..n Type
notDef A == A  False
Thm* A:Prop. (A Prop

About:
decidableintsetuniversememberprop
impliesandorfalseall
!abstraction
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Definitions int 2 Sections StandardLIB Doc