An automorphism of a map is an isomorphism from the map to itself.

一个地图的自同构就是到它本身的一个同构。

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This paper prove that there are only eleven four—rings up to isomorphism.

本文证明了在同构意义下四元环仅有十一个。

youdao

This paper prove that there are only eleven four—rings up to isomorphism.

本文证明了在同构意义下四元环仅有十一个。

youdao