| Some definitions of interest. |
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ball | Def  x:T. P(x) ==  ( x:T. P(x)) |
| | Thm* T:Type, P:(T  ). ( x:T. P(x))  |
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band | Def p q == if p q else false fi |
| | Thm* p,q: . (p q)  |
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bequal | Def x = y ==  (x = y T) |
| | Thm* T:Type, x,y:T. (x = y)  |
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bexists | Def  x:T. P(x) ==  ( x:T. P(x)) |
| | Thm* T:Type, P:(T  ). ( x:T. P(x))  |
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bimplies | Def p  q ==  p  q |
| | Thm* p,q: . p  q  |
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prop_to_bool | Def  P == InjCase(lem(P) ; true ; false ) |
| | Thm* P:Prop. ( P)  |
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stype | Def S == {T:Type| x:T. True } |
| | Thm* S Type{2} |
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type_definition | Def type_definition('a;'b;P;rep)
Def == ( x',x'':'b. rep(x') = rep(x'') 'a  x' = x'')
Def == & ( x:'a. (P(x))  ( x':'b. x = rep(x'))) |
| | Thm* 'a,'b:Type, P:('a  ), rep:('b 'a). type_definition('a;'b;P;rep) Prop |