reserve V for RealLinearSpace,
  u,u1,u2,v,v1,v2,w,w1,x,y for VECTOR of V,
  a,a1,a2,b,b1,b2,c1,c2,n,k1,k2 for Real;

theorem Th8:
  Gen x,y implies ex v st u=Ortm(x,y,v)
proof
  assume
A1: Gen x,y;
  take Ortm(x,y,u);
  thus thesis by A1,Th7;
end;
