Підтримка:This paper is a contribution to the Proceedings of the Workshop “Geometric Aspects of Discrete and UltraDiscrete Integrable Systems” (March 30 – April 3, 2009, University of Glasgow, UK). The full collection is available at http://www.emis.de/journals/SIGMA/GADUDIS2009.html.
This work had been started in May 2007, when one of the authors (APV) visited Patras within the Erasmus-Socrates exchange programme, and completed at the Isaac Newton Institute for Mathematical Sciences in Cambridge during the programme on Discrete Integrable Systems in the spring semester 2009. The work of APV was also partially supported by the European RTN ENIGMA (contract MRTN-CT-2004-5652) and EPSRC (grant EP/E004008/1). We are grateful to V. Adler for useful comments.
We use the classification of the quadrirational maps given by Adler, Bobenko and Suris to describe when such maps satisfy the Yang-Baxter relation. We show that the corresponding maps can be characterized by certain singularity invariance condition. This leads to some new families of Yang-Baxter maps corresponding to the geometric symmetries of pencils of quadrics.