is mentioned by

Thm* (A B) (B C) (A C)	[prop_iff_trans]
Thm* B (A B & C) (A C)	[prop_and_iff]
Def ReflectsProp(P; qP; Tr) == t,qt:Term. qt reps t {Tr(qP/qt) Tr(t)}	[ReflectsProp]

In prior sections: core