Definitions rel 1 Sections StandardLIB Doc
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Some definitions of interest.
equiv_relDef EquivRel x,y:TE(x;y)
Def == Refl(T;x,y.E(x;y)) & (Sym x,y:TE(x;y)) & (Trans x,y:TE(x;y))
Thm* T:Type, E:(TTProp). (EquivRel x,y:TE(x,y))  Prop
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop
reflDef Refl(T;x,y.E(x;y)) == a:TE(a;a)
Thm* T:Type, E:(TTProp). Refl(T;x,y.E(x,y))  Prop
symDef Sym x,y:TE(x;y) == a,b:TE(a;b E(b;a)
Thm* T:Type, E:(TTProp). (Sym x,y:TE(x,y))  Prop
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