Some definitions of interest.
eqfun_p	Def IsEqFun(T;eq) == x,y:T. (x eq y)  x = y
	Thm* T:Type, eq:(TT). IsEqFun(T;eq)  Prop
sq_stable	Def SqStable(P) == P  P
	Thm* A:Prop. SqStable(A)  Prop

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