reserve a,b,c,d,e,f for Real,
        k,m for Nat,
        D for non empty set,
        V for non trivial RealLinearSpace,
        u,v,w for Element of V,
        p,q,r for Element of ProjectiveSpace(V);
reserve o,p,q,r,s,t for Point of TOP-REAL 3,
        M for Matrix of 3,F_Real;
reserve pf for FinSequence of D;
reserve PQR for Matrix of 3,F_Real;

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;
