def un.lt_dbl1
import bend-osdev-u32@0.1.0.0/PROOF.bend as PROOFimport Base
149def un.lt_dbl1(x: Nat, y: Nat) -> {Nat.is_lt(1n+Nat.double(x), Nat.double(y)) == Nat.is_lt(x, y) : Bool}:
150 match x y:
151 case 0n 0n:
152 {==}
153 case 0n 1n+q:
154 {==}
155 case 1n+p 0n:
156 {==}
157 case 1n+p 1n+q:
158 un.lt_dbl1(p, q)