| ⊦ gcd(gcd(m, n), n0) | gcd(m, gcd(n, n0)) |
⊦ n0 | m ∧ n0 | n → n0 | gcd(m, n)
gcd(gcd(m, n), n0) | m ∧ gcd(gcd(m, n), n0) | gcd(n, n0) → gcd(gcd(m, n), n0) | gcd(m, gcd(n, n0)) ⊦ gcd(gcd(m, n), n0) | gcd(m, gcd(n, n0))
Used terms: gcd(gcd(m, n), n0), m, gcd(n, n0)