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2020•Geometriae DedicataOpen access

On the horofunction boundary of discrete Heisenberg group

Uri Bader, Vladimir Finkelshtein

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Abstract

Abstract We consider a finitely generated group endowed with a word metric. The group acts on itself by isometries, which induces an action on its horofunction boundary. The conjecture is that nilpotent groups act trivially on their reduced boundary. We will show this for the Heisenberg group. The main tool will be a discrete version of the isoperimetric inequality.

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Abstract We consider a finitely generated group endowed with a word metric. The group acts on itself by isometries, which induces an action on its horofunction boundary. The conjecture is that nilpotent groups act trivially on their reduced boundary. We will show this for the Heisenberg group. The main tool will be a discrete version of the isoperimetric inequality.

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Abstract We consider a finitely generated group endowed with a word metric. The group acts on itself by isometries, which induces an action on its horofunction boundary. The conjecture is that nilpotent groups act trivially on their reduced boundary. We will show this for the Heisenberg group. The main tool will be a discrete version of the isoperimetric inequality.

Key concepts: Isoperimetric inequality, Heisenberg group, Boundary (topology), Discrete group, Group (periodic table), Conjecture, Mathematics, Nilpotent group

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