Who Cites is commutative sep?
is_commutative_sep	Def  is_commutative_sep(A; f) == is_commutative(A; x,z.(f(x,z)))
	Thm*  f:(AAA). is_commutative_sep(A; f)  Prop
is_commutative	Def  is_commutative(A; x,z.f(x;z)) == x,z:A. f(x;z) = f(z;x)  A
	Thm*  f:(AAA). is_commutative(A; x,z.f(x,z))  Prop

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