def un.lt_dbl
import bend-osdev-u32@0.1.0.0/PROOF.bend as PROOFimport Base
138def un.lt_dbl(x: Nat, y: Nat) -> {Nat.is_lt(Nat.double(x), Nat.double(y)) == Nat.is_lt(x, y) : Bool}:
139 match x y:
140 case 0n 0n:
141 {==}
142 case 0n 1n+q:
143 {==}
144 case 1n+p 0n:
145 {==}
146 case 1n+p 1n+q:
147 un.lt_dbl(p, q)