def pow_sub1.go

lawful-words@0.1.0.0 · proof_nat.bend:1414

import Base

1414def pow_sub1.go(+u: Nat) -> {Nat.sub(Nat.double(1n+u), 1n) == 1n+Nat.double(Nat.sub(1n+u, 1n)) : Nat}:
1415  %Equal.sym(Nat, Nat.sub(u, 0n), u, sub_zero(u)) : {Nat.sub(Nat.double(1n+u), 1n) == 1n+Nat.double(_) : Nat}
1416  {==}