⊦ ∃ m0. m0 + m0 = 2 + m + m
Used simplifier rules: a: ⊦ (m + n0) + n1 = m + n0 + n1;%c: ⊦ m + n = n + m;%even-06: ⊦ m + m ≠ n + n + 1;