
theorem
  for a,b be Complex, n,k be Nat st k in Segm (n+1)
   ex c be object, l be Nat st l = n-k & c = a|^l*b|^k
  proof
    let a,b be Complex, n,k be Nat;
    assume k in Segm (n+1); then
    reconsider l1 = n - k as Nat by LmA;
    a|^l1*b|^k is object;
    hence thesis;
  end;
