reserve S for non empty satisfying_Tarski-model
              TarskiGeometryStruct,
        a,b,c,d,c9,x,y,z,p,q,q9 for POINT of S;
reserve              S for satisfying_Tarski-model TarskiGeometryStruct,
        a,a9,b,b9,c,c9 for POINT of S;

theorem Lem01:
  reflection(a,a) = a
  proof
    Middle a,a,a by GTARSKI3:97;
    hence thesis by GTARSKI3:100;
  end;
