Birkhoff定理的推广

The Extending of Birkhoff Theorem

因Birkhoff定理是对不含宇宙项A的四维时空成立，本文将该定理推广到合宇宙项A的高维时空。

Deals with extending Birkhoff theorem to multidimensional space and time containing cosmic termA,based on the theorem's application of the four－dimensional space and time.