Simplicial nonpositive curvature

• Autores: Tadeusz Januszkiewicz, Jacek Swiatkowski
• Localización: Publications Mathématiques de L'IHÉS, ISSN 0073-8301, Vol. 104, Nº. 1, 2006, págs. 1-85
• Idioma: inglés
• DOI: 10.1007/s10240-006-0038-5
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• Resumen

  • We introduce a family of conditions on a simplicial complex that we call local k-largeness (k=6 is an integer). They are simply stated, combinatorial and easily checkable. One of our themes is that local 6-largeness is a good analogue of the non-positive curvature: locally 6-large spaces have many properties similar to non-positively curved ones. However, local 6-largeness neither implies nor is implied by non-positive curvature of the standard metric. One can think of these results as a higher dimensional version of small cancellation theory. On the other hand, we show that k-largeness implies non-positive curvature if k is sufficiently large. We also show that locally k-large spaces exist in every dimension. We use this to answer questions raised by D. Burago, M. Gromov and I. Leary.