Some definitions of interest.
decidable	Def Dec(P) == P  P
	Thm* A:Prop. Dec(A)  Prop
l_all	Def (xL.P(x)) == x:T. (x  L)  P(x)
	Thm* T:Type, L:T List, P:(TProp). (xL.P(x))  Prop

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