| Some definitions of interest. |
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assert | Def b == if b True else False fi |
| | Thm* b:. b Prop |
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filter | Def filter(P;l) == reduce(a,v. if P(a) [a / v] else v fi;nil;l) |
| | Thm* T:Type, P:(T), l:T List. filter(P;l) T List |
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iff | Def P Q == (P Q) & (P Q) |
| | Thm* A,B:Prop. (A B) Prop |
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l_member | Def (x l) == i:. i<||l|| & x = l[i] T |
| | Thm* T:Type, x:T, l:T List. (x l) Prop |