law de_morgan_or_sym

bend-mathlib@0.8.1.0 · bool.bend:655

import Base

655# De Morgan: not (a or b) is (not a) and (not b), reversed to rewrite toward the simple side.
656law de_morgan_or_sym:
657  for a: Bool
658  for -b: Bool
659  {Bool.and(Bool.not(a), Bool.not(b)) == Bool.not(Bool.or(a, b)) : Bool}