def mul_left
import bend-collections-laws-math@1.0.0.0/proofs/math/natural/proof.bend as Proofimport Base
import bend-collections-laws-math@1.0.0.0/spec/math/natural.bend as S
import bend-collections-laws-math@1.0.0.0/proofs/math/natural/lcm.bend as LC
48def mul_left(+c: Nat, +a: Nat, +b: Nat) -> S.Gcd.mul_left(c, a, b):
49 LC.gcd_mul_left(c, a, b)