Meanwhile, the Drazin inverses of PQ and P - Q are established.同时, 给出正交投影的积PQ和差P -Q 的Drazin逆的表达式.In this paper, we investigate the Drazin inverse of a morphism in additive category.本文研究了加法范畴上态射的Drazin逆....

drazin的音标：drazin的英式发音音标为：[d'rɑ:zɪn]drazin的美式发音音标为：[d'rɑzɪn]...

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