NOTE:

This operator coercing a to a Prop is normally invisible since it is pretty obvious when it is needed.

	Who Cites assert?
assert	Def b == if b True else False fi
	Thm* b:. b Prop
iff	Def P Q == (P Q) & (P Q)
	Thm* A,B:Prop. (A B) Prop
is_member	Def x(eq) L == (letrec is_member x eq L = (Case of L; nil false ; h.t if eq(x,h) true else is_member(x,eq,t) fi) ) (x,eq,L)
	Thm* T:Type, eq:(TT), u:T. u(eq) nil
	Thm* T:Type, eq:(TT), x:T, L:T List. x(eq) L
list_exists	Def xL.P(x) == (letrec list_exists L = (Case of L; nil False ; h.t P(h) list_exists(t)) ) (L)
	Thm* T:Type, P:(TProp), L:T List. xL.P(x) Type
rev_implies	Def P Q == Q P
	Thm* A,B:Prop. (A B) Prop
letrec_body	Def = b == b
letrec_arg	Def x b(x) (x) == b(x)
letrec	Def (letrec f b(f)) == b((letrec f b(f)) ) (recursive)

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