 reserve n,i,k,m for Nat;
 reserve p for Prime;

theorem
  rseq(0,1,1,0) = invNAT
  proof
    for n being Element of NAT holds
      rseq(0,1,1,0).n = invNAT.n
    proof
      let n be Element of NAT;
      rseq(0,1,1,0).n = 1 / (1 * n + 0) by AlgDef
                 .= invNAT.n by MOEBIUS2:def 2;
      hence thesis;
    end;
    hence thesis by FUNCT_2:63;
  end;
