Th`ese de doctorat - IMJ-PRG
Proof. We just prove the first equality, the proof for the second one is similar. By replacing x with x y .y we have: x ? (1 ? x/y) ? y ? (1 ? y/x) = x ...
Proof. We just prove the first equality, the proof for the second one is similar. By replacing x with x y .y we have: x ? (1 ? x/y) ? y ? (1 ? y/x) = x ...