Definitions hol list 2 Sections HOLlib Doc
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Some definitions of interest.
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop
stypeDef S == {T:Type| x:T. True }
Thm* S  Type{2}

About:
setuniversememberpropimplies
andtrueallexists
!abstraction
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Definitions hol list 2 Sections HOLlib Doc