Definitions hol bool Sections HOLlib Doc
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Some definitions of interest.
letDef let x = a in b(x) == (x.b(x))(a)
Thm* A,B:Type, a:Ab:(AB). let x = a in b(x B
stypeDef S == {T:Type| x:T. True }
Thm* S  Type{2}
tlambdaDef (x:Tb(x))(x) == b(x)

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Definitions hol bool Sections HOLlib Doc