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;

theorem
  (1_Rmatrix(3)).1 = <e1> & (1_Rmatrix(3)).2 = <e2> &
  (1_Rmatrix(3)).3 = <e3> by MATRIXR2:77,MATRIXR2:78,EUCLID_8:def 1,
