Observational properties of the largest Local Group spiral M31(Andromeda galaxy) are presented.

介绍了本星系群中最大的旋涡星系M31（仙女星系）的基本观测性质。

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In this paper we investigate algebraic properties of the set of local formations which satisfy n, and for such formation we give the structure of minimal non group.

本文研究了满足条件N的局部群系集合的代数性质，同时对于这类群类，给出了极小非-群的结构。

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