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- W1975022404 abstract "The k-dimensional Dehn (or isoperimetric) function of a group bounds the volume of efficient ball-fillings of k-spheres mapped into k-connected spaces on which the group acts properly and cocompactly; the bound is given as a function of the volume of the sphere. We advance significantly the observed range of behavior for such functions. First, to each non-negative integer matrix P and positive rational number r, we associate a finite, aspherical 2-complex X_{r,P} and calculate the Dehn function of its fundamental group G_{r,P} in terms of r and the Perron-Frobenius eigenvalue of P. The range of functions obtained includes x^s, where s is an arbitrary rational number greater than or equal to 2. By repeatedly forming multiple HNN extensions of the groups G_{r,P} we exhibit a similar range of behavior among higher-dimensional Dehn functions, proving in particular that for each positive integer k and rational s greater than or equal to (k+1)/k there exists a group with k-dimensional Dehn function x^s. Similar isoperimetric inequalities are obtained for arbitrary manifold pairs (M,partial M) in addition to (B^{k+1},S^k)." @default.
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- W1975022404 date "2009-01-01" @default.
- W1975022404 modified "2023-09-26" @default.
- W1975022404 title "Snowflake groups, Perron–Frobenius eigenvalues and isoperimetric spectra" @default.
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- W1975022404 doi "https://doi.org/10.2140/gt.2009.13.141" @default.
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