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
symmetrizeDef Symmetrize(x,y.R(x;y);a;b) == R(a;b) & R(b;a)
Thm* T:Type{j}, R:(TTProp{i}), a,b:T. Symmetrize(x,y.R(x,y);a;b Prop{i}
transDef Trans x,y:TE(x;y) == a,b,c:TE(a;b E(b;c E(a;c)
Thm* T:Type, E:(TTProp). (Trans x,y:TE(x,y))  Prop

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Definitions rel 1 Sections StandardLIB Doc