任意subspace A belongs to(V,V*) if the subspace A has no de-space presentation, which means has no subspace B in V let any a belongs to A, Im(a(B)) belongs to B.
We has
(1)the only 线性变换F let F has F^-1 make Fb=bF^-1 is homonophised to I
(2)if F^-1=F,F are scalars