n:, T:Type, P:(TProp), R1, R2:(TTProp).
when P, R1 => R2  R1 preserves P  when P, R1^n => R2^n 

latex

Definitions	AB, A, False, R^n, R preserves P, when P, R1 => R2, Prop, ij, P  Q, x:A. B(x), t  T, , i=j, x f y, Unit, P  Q, , b, b, x:A. B(x), P & Q
Lemmas	le wf, rel exp wf, assert wf, not wf, bnot wf, bool wf, eq int wf, assert of eq int, not functionality wrt iff, assert of bnot, iff transitivity, eqff to assert, eqtt to assert, cond rel implies wf, preserved by wf, nat wf, nat properties, ge wf