Definitions hol combin Sections HOLlib Doc
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Some definitions of interest.
composeDef (f o g)(x) == f(g(x))
Thm* A,B,C:Type, f:(BC), g:(AB). f o g  AC
stypeDef S == {T:Type| x:T. True }
Thm* S  Type{2}
tlambdaDef (x:Tb(x))(x) == b(x)

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IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

Definitions hol combin Sections HOLlib Doc