Definitions ElisTarskiPf A Sections NuprlLIB Doc

Some definitions of interest.
iff Def P Q == (P Q) & (P Q)
Thm* A,B:Prop. (A B) Prop
not Def A == A False
Thm* A:Prop. (A) Prop

About:
memberpropimpliesandfalseall!abstraction

Definitions ElisTarskiPf A Sections NuprlLIB Doc