Bool.de_morgan_or: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/bool.bend as Bool
Lines 171-175 of bend-mathlib@0.8.1.0/bool.bend: https://jend.leeeet.dev/read.txt?path=bend-mathlib@0.8.1.0/bool.bend&start_line=171&end_line=175

import Base

# De Morgan: not (a or b) is (not a) and (not b).
law de_morgan_or:
  for a: Bool
  for -b: Bool
  {Bool.not(Bool.or(a, b)) == Bool.and(Bool.not(a), Bool.not(b)) : Bool}

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.not
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.or