theorem Th18:
  for X,Y be ComplexLinearSpace holds (the carrier of X) --> 0.Y
  is LinearOperator of X,Y
proof
  let X,Y be ComplexLinearSpace;
  set f=(the carrier of X) --> 0.Y;
  reconsider f as Function of X,Y;
A1: f is homogeneous
  proof
    let x be VECTOR of X, c be Complex;
    thus f.(c*x) =0.Y by FUNCOP_1:7
      .=c*0.Y by CLVECT_1:1
      .= c*f.x by FUNCOP_1:7;
  end;
  f is additive
  proof
    let x,y be VECTOR of X;
    thus f.(x+y) = 0.Y by FUNCOP_1:7
      .=0.Y+0.Y by RLVECT_1:4
      .= f.x+0.Y by FUNCOP_1:7
      .= f.x+f.y by FUNCOP_1:7;
  end;
  hence thesis by A1;
end;
