The Non-Commutative A 1 T-System and its Positive Laurent Property

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We define a non-commutative version of the A1 T-system, which underlies frieze patterns of the integer plane. This system has discrete conserved quantities and has a particular reduction to the known non-commutative Q-system for A1. We solve the system by generalizing the flat GL2 connection method used in the commuting case to a 2 × 2 flat matrix connection with non-commutative entries. This allows us to prove the non-commutative positive Laurent phenomenon for the solutions when expressed in terms of admissible initial data. These are rephrased as partition functions of paths with non-commutative weights on networks, and alternatively of dimer configurations with non-commutative weights on ladder graphs made of chains of squares and hexagons.

Original languageEnglish (US)
Pages (from-to)935-953
Number of pages19
JournalCommunications in Mathematical Physics
Issue number2
StatePublished - Apr 2015

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics


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