研究了提升模的任意直和在什么条件下仍是提升模。
When a direct sum of lifting modules is lifting is studied here.
马蒂：全都是斑马，和我长得一模一样。等一下，我们这是在哪儿？
Marty: All those zebras, like me. Wait a minute, where are we?
想象一下您在一个和现实生活中您最喜欢的一模一样的三维商场里冲浪。
Imagine surfing in a 3d mall which is an exact duplication of your favorite mall.
想象一下您在一个和现实生活中您最喜欢的一模一样的三维商场里冲浪。
Imagine surfing in a 3d mall which is an exact duplication of your favorite mall.
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