获得了内积空间关于弱闭凸集的最佳逼近元的存在性及其刻划定理。

In the inner product space, the existence theory of best approximation element was obtained and described.

youdao

证明了相对正规分离性是遗传的、相对闭集传递的、弱同胚不变的、L -好的推广性质。

It is proved that relative hereditary, relative closed transition, weak homeomorphic invariant, L-good extension are all valid.

youdao