Let V be a vector space, ( , u',W are Subspaces of V that UOWV WOW=V how to prove that for every well there is a unique ZE U' that u- ZEW and that the mapping from " to ? is an isomorphism of vector spaces ? a Also, If I: U- W is any linear. . mapping, how to show that. there exists u" Ow = 183, ("@W = V that ( " = Su + L (R , | REUS CV