def dm2
import bend-collections-laws-math@1.0.0.0/proofs/math/typed/f64divf.bend as F64divfimport Base
import bend-collections-laws-math@1.0.0.0/proofs/math/typed/f64light.bend as FL
47def dm2(+l: Bool, +r: Bool) -> {Bool.or(Bool.not(r), Bool.not(l)) == Bool.not(Bool.and(l, r)) : Bool}:
48 FL.dm2(l, r)