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hep-th2001
Y-systems and generalized associahedra
Sergey Fomin, Andrei Zelevinsky
We prove, for an arbitrary finite root system, the periodicity conjecture of Al.B.Zamolodchikov concerning Y-systems, a particular class of functional relations arising in the theo…
math.RT2001
Cluster algebras I: Foundations
Sergey Fomin, Andrei Zelevinsky
In an attempt to create an algebraic framework for dual canonical bases and total positivity in semisimple groups, we initiate the study of a new class of commutative algebras.