Definitions rel 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
linorderDef Linorder(T;x,y.R(x;y)) == Order(T;x,y.R(x;y)) & Connex(T;x,y.R(x;y))
Thm* T:Type, R:(TTProp). Linorder(T;x,y.R(x,y))  Prop
strict_partDef strict_part(x,y.R(x;y);a;b) == R(a;b) & R(b;a)
Thm* T:Type, R:(TTProp), a,b:T. strict_part(x,y.R(x,y);a;b Prop
notDef A == A  False
Thm* A:Prop. (A Prop

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Definitions rel 1 Sections StandardLIB Doc