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100   $a20181125d2018      uy             0
101 0 $aeng
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181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aCluster algebras and triangulated surfaces$hPart II$iLambda lengths /$fSergey Fomin, Dylan Thurston
210  1$aProvidence, Rhode Island :$cAmerican Mathematical Society,$d2018.
215   $a1 online resource (110 pages)
225 1 $aMemoirs of the American Mathematical Society ;$vNumber 1223
311   $a1-4704-2967-5 
327   $aCover -- Title page -- Chapter 1. Introduction -- Chapter 2. Non-normalized cluster algebras -- Chapter 3. Rescaling and normalization -- Chapter 4. Cluster algebras of geometric type and their positive realizations -- Chapter 5. Bordered surfaces, arc complexes, and tagged arcs -- Chapter 6. Structural results -- Chapter 7. Lambda lengths on bordered surfaces with punctures -- Chapter 8. Lambda lengths of tagged arcs -- Chapter 9. Opened surfaces -- Chapter 10. Lambda lengths on opened surfaces -- Chapter 11. Non-normalized exchange patterns from surfaces -- Chapter 12. Laminations and shear coordinates -- Chapter 13. Shear coordinates with respect to tagged triangulations -- Chapter 14. Tropical lambda lengths -- Chapter 15. Laminated Teichmu?ller spaces -- Chapter 16. Topological realizations of some coordinate rings -- Chapter 17. Principal and universal coefficients -- Appendix A. Tropical degeneration and relative lambda lengths -- Appendix B. Versions of Teichmu?ller spaces and coordinates -- Bibliography -- Back Cover.
330   $aFor any cluster algebra whose underlying combinatorial data can be encoded by a bordered surface with marked points, the authors construct a geometric realization in terms of suitable decorated Teichmu?ller space of the surface. On the geometric side, this requires opening the surface at each interior marked point into an additional geodesic boundary component. On the algebraic side, it relies on the notion of a non-normalized cluster algebra and the machinery of tropical lambda lengths. The authors' model allows for an arbitrary choice of coefficients which translates into a choice of a family of integral laminations on the surface. It provides an intrinsic interpretation of cluster variables as renormalized lambda lengths of arcs on the surface. Exchange relations are written in terms of the shear coordinates of the laminations and are interpreted as generalized Ptolemy relations for lambda lengths. This approach gives alternative proofs for the main structural results from the authors' previous paper, removing unnecessary assumptions on the surface.
410  0$aMemoirs of the American Mathematical Society ;$vNumber 1223.
606   $aCluster algebras
606   $aLambda algebra
606   $aTeichmu?ller spaces
608   $aElectronic books.
615  0$aCluster algebras.
615  0$aLambda algebra.
615  0$aTeichmu?ller spaces.
676   $a512.44
700   $aFomin$b Sergey$01029900
702   $aThurston$b Dylan
801  0$bMiAaPQ
801  1$bMiAaPQ
801  2$bMiAaPQ
906   $aBOOK
912   $a9910478891603321
996   $aCluster algebras and triangulated surfaces$92446549
997   $aUNINA