On Dehn functions and products of groups

On Dehn functions and products of groups
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论群的 Dehn 函数和乘积

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发表时间:
1993
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通讯作者:
S. Brick
S. Brick
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作者:
S. Brick

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如果G是一个有限表示的群,那么它的Dehn函数——或者它的等周不等式——是有趣的。例如,如果G是负弯曲的(或格罗莫夫意义上的双曲),则G满足线性等周不等式。同样,如果G具有自动结构,则G满足二次等周不等式。我们研究了某些自然运算对Dehn函数的影响。我们考虑直接积,取有限指数的子群,自由积,合并和HNN扩展
If G is a finitely presented group then its Dehn function ― or its isoperimetric inequality ― is of interest. For example, G satisfies a linear isoperimetric inequality iff G is negatively curved (or hyperbolic in the sense of Gromov). Also, if G possesses an automatic structure then G satisfies a quadratic isoperimetric inequality. We investigate the effect of certain natural operations on the Dehn function. We consider direct products, taking subgroups of finite index, free products, amalgamations, and HNN extensions