Who Cites preserved by2?
preserved_by2	Def (ternary) R preserves P  == x,y,z:T. P(x)  P(y)  R(x,y,z)  P(z)
	Thm* T:Type, P:(TProp), R:(TTTProp). (ternary) R preserves P   Prop

Syntax:

(ternary) R preserves P

has structure:

preserved_by2(T; R; P)

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