YES linear polynomial interpretations on natural numbers: odd_A(x1) = 2 s_A(x1) = 1 false_A = 1 true_A = 2 even_A(x1) = x1 + 2 zero_A(x1) = x1 0_A = 2 the condition zero(s(x)) ->> true() is unsatisfiable for all substitutions.