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arXiv 1701.05947math.GR
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关于组词图象的对称性

On the Symmetry of Images of Word Maps in Groups

William Cocke, Meng-Che Ho

摘要:

群中的词映射是群中多项式的一种类似物,通过形式词的替换来定义。Lubotzky给出了字映射在有限单群中的象的一个刻画,其刻画的一个结果是存在一个群G使得G上某个字映射的象在反演下不闭。我们探讨了一个群上的充分条件,确保所有字映射在G上的图像是封闭的反演。然后,我们表明,只有两个组的顺序小于108的性质,有一个字的地图与图像不关闭下反转。我们还研究了幂零群中的这种行为。

英文摘要:

Word maps in a group, an analogue of polynomials in groups, are defined by substitution of formal words. Lubotzky gave a characterization of the images of word maps in finite simple groups, and a consequence of his characterization is the existence of a group G such that the image of some word map on G is not closed under inversion. We explore sufficient conditions on a group that ensure that the image of all word maps on G are closed under inversion. We then show that there are only two groups with order less than 108 with the property that there is a word map with image not closed under inversion. We also study this behavior in nilpotent groups.

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