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14
Matched pairs approach to set theoretic solutions of the YangBaxter equation
 J. Algebra
"... Abstract. We study settheoretic solutions (X, r) of the YangBaxter equations on a set X in terms of the induced left and right actions of X on itself. We give a characterization of involutive squarefree solutions in terms of cyclicity conditions. We characterise general solutions in terms of an i ..."
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Cited by 4 (4 self)
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Abstract. We study settheoretic solutions (X, r) of the YangBaxter equations on a set X in terms of the induced left and right actions of X on itself. We give a characterization of involutive squarefree solutions in terms of cyclicity conditions. We characterise general solutions in terms of an induced matched pair of unital semigroups S(X, r) and construct (S, rS) from the matched pair. Finally, we study extensions of solutions in terms of matched pairs of their associated semigroups. We also prove several general results about matched pairs of unital semigroups of the required type, including iterated products S ⊲ ⊳ S ⊲ ⊳ S underlying the proof that rS is a solution, and extensions (S ⊲ ⊳ T, rS⊲⊳T). Examples include a general ‘double ’ construction (S ⊲ ⊳ S, rS⊲⊳S) and some concrete extensions, their actions and graphs based on small sets. 1.
Lie 2algebras
, 2004
"... I would like to express my sincere gratitude to my advisor, John Baez, for his patience, guidance, enthusiasm, encouragement, inspiration, and humor. Additionally, I am indebted to Vyjayanthi Chari, James Dolan, and XiaoSong Lin for their willingness to share their knowledge with me numerous times ..."
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Cited by 4 (1 self)
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I would like to express my sincere gratitude to my advisor, John Baez, for his patience, guidance, enthusiasm, encouragement, inspiration, and humor. Additionally, I am indebted to Vyjayanthi Chari, James Dolan, and XiaoSong Lin for their willingness to share their knowledge with me numerous times during my graduate studies. I also thank my ‘mathematical brothers’: Miguel CarriónÁlvarez, Toby Bartels, Jeffrey Morton, and Derek Wise for their friendship and engaging, educational conversations. I am grateful for the assistance of Aaron Lauda in drawing various braid diagrams, and thank Ronnie Brown, Andrée Ehresmann, Thomas Larsson, James Stasheff, J. Scott Carter, and Masahico Saito for helpful discussions and correspondence. Finally, I am extremely appreciative of the love and support of my family, friends, and former professors during my time as a graduate student. I certainly could not have accomplished all that I have without them. iii ABSTRACT OF THE DISSERTATION
QUANTUM SPACES ASSOCIATED TO MULTIPERMUTATION SOLUTIONS OF LEVEL TWO
"... Abstract. We study finite settheoretic solutions (X, r) of the YangBaxter equation of squarefree multipermutation type. We show that each such solution over C with multipermutation level two can be put in diagonal form with the associated YangBaxter algebra A(C, X, r) having a qcommutation form ..."
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Cited by 3 (2 self)
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Abstract. We study finite settheoretic solutions (X, r) of the YangBaxter equation of squarefree multipermutation type. We show that each such solution over C with multipermutation level two can be put in diagonal form with the associated YangBaxter algebra A(C, X, r) having a qcommutation form of relations determined by complex phase factors. These complex factors are roots of unity and all roots of a prescribed form appear as determined by the representation theory of the finite abelian group G of left actions on X. We study the structure of A(C, X, r) and show that they have a •product form ‘quantizing ’ the commutative algebra of polynomials in X  variables. We obtain the •product both as a Drinfeld cotwist for a certain canonical 2cocycle and as a braidedopposite product for a certain crossed Gmodule (over any field k). We provide first steps in the noncommutative differential geometry of A(k, X, r) arising from these results. As a byproduct of our work we find that every such level 2 solution (X, r) factorises as r = f ◦ τ ◦ f −1 where τ is the flip map and (X, f) is another solution coming from X as a crossed Gset. 1.
YangBaxter maps: dynamical point of view A.P.Veselov Department of Mathematical Sciences, Loughborough University,
, 2006
"... Abstract A review of some recent results on the dynamical theory of the YangBaxter maps (also known as settheoretical solutions to the quantum YangBaxter equation) is given. The central question is the integrability of the transfer dynamics. The relations with matrix factorisations, matrix KdV so ..."
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Abstract A review of some recent results on the dynamical theory of the YangBaxter maps (also known as settheoretical solutions to the quantum YangBaxter equation) is given. The central question is the integrability of the transfer dynamics. The relations with matrix factorisations, matrix KdV solitons, Poisson Lie groups, geometric crystals and tropical combinatorics are discussed and demonstrated on several concrete examples.
SET THEORETIC SOLUTIONS OF THE YANGBAXTER EQUATION, GRAPHS AND COMPUTATIONS
, 705
"... Abstract. We extend our recent work on settheoretic solutions of the YangBaxter or braid relations with new results about their automorphism groups, strong twisted unions of solutions and multipermutation solutions. We introduce and study graphs of solutions and use our graphical methods for the c ..."
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Abstract. We extend our recent work on settheoretic solutions of the YangBaxter or braid relations with new results about their automorphism groups, strong twisted unions of solutions and multipermutation solutions. We introduce and study graphs of solutions and use our graphical methods for the computation of solutions of finite order and their automorphisms. Results include a detailed study of solutions of multipermutation level 2. 1.
BINOMIAL SKEW POLYNOMIAL RINGS, ARTINSCHELTER REGULARITY, AND BINOMIAL SOLUTIONS OF THE YANGBAXTER EQUATION
, 909
"... Abstract. Let k be a field and X be a set of n elements. We introduce and study a class of quadratic kalgebras called quantum binomial algebras. Our main result shows that such an algebra A defines a solution of the classical YangBaxter equation (YBE), if and only if its Koszul dual A! is Frobeniu ..."
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Abstract. Let k be a field and X be a set of n elements. We introduce and study a class of quadratic kalgebras called quantum binomial algebras. Our main result shows that such an algebra A defines a solution of the classical YangBaxter equation (YBE), if and only if its Koszul dual A! is Frobenius of dimension n, with a regular socle and for each x, y ∈ X an equality of the type xyy = αzzt, where α ∈ k \ {0}, and z, t ∈ X is satisfied in A. We prove the equivalence of the notions a binomial skew polynomial ring and a binomial solution of YBE. This implies that the YangBaxter algebra of such a solution is of PoincaréBirkhoffWitt type, and possesses a number of other nice properties such as being Koszul, Noetherian, and an ArtinSchelter regular domain.
GARSIDE STRUCTURE ON MONOIDS WITH QUADRATIC SQUAREFREE RELATIONS
, 909
"... Abstract. We show the intimate connection between various mathematical notions that are currently under active investigation: a class of Garside monoids, with a “nice ” Garside element, certain monoids S with quadratic relations, whose monoidal algebra A = kS has a Frobenius Koszul dual A! with regu ..."
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Abstract. We show the intimate connection between various mathematical notions that are currently under active investigation: a class of Garside monoids, with a “nice ” Garside element, certain monoids S with quadratic relations, whose monoidal algebra A = kS has a Frobenius Koszul dual A! with regular socle, the monoids of skewpolynomial type (or equivalently, binomial skewpolynomial rings) which were introduced and studied by the author and in 1995 provided a new class of Noetherian ArtinSchelter regular domains, and the squarefree settheoretic solutions of the YangBaxter equation. There is a beautiful symmetry in these objects due to their nice combinatorial and algebraic properties. 1.
with an Invariance Condition By
, 704
"... By means of left quasigroups L = (L, ·) and ternary systems, we construct dynamical YangBaxter maps associated with L, L, and (·) satisfying an invariance condition that the binary operation (·) of the left quasigroup L defines. Conversely, this construction characterize such dynamical YangBaxter ..."
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By means of left quasigroups L = (L, ·) and ternary systems, we construct dynamical YangBaxter maps associated with L, L, and (·) satisfying an invariance condition that the binary operation (·) of the left quasigroup L defines. Conversely, this construction characterize such dynamical YangBaxter maps. The unitary condition of the dynamical YangBaxter map is discussed. Moreover, we establish a correspondence between two dynamical YangBaxter maps constructed in this paper. This correspondence produces a version of the vertexIRF correspondence. 1