theorem Th64:
  for p being FinSequence of REAL st len p = 3 holds len F2M p = 3
  proof
    let p being FinSequence of REAL;
    assume len p = 3;
    then F2M p = <* <*p.1*>, <*p.2*>, <*p.3*> *> by DEF1;
    hence thesis by FINSEQ_1:45;
  end;
