Combinatorics around the q-Onsager algebra, 2020

or those of you interested in attending the "Combinatorics around the q-Onsager Algebra" Conference in Slovenia this July, we would like to remind you that the deadline for submitting abstracts for contributed talks is Feb. 29.  After that deadline, submitted abstracts will be considered only if space is available.

For everyone attending, please register and pay the conference fee no later than May 31 in order to get the discounted rate of 180 euros.  Please see our conference website ( to register and for more information.

Most sincerely,

Stefko Miklavic (University of Primorska)

Mark MacLean (Seattle University)


This is an announcement of a conference this year entitled "Combinatorics around the q-Onsager algebra." At the conference we will be celebrating the 65th birthday of Paul Terwilliger.  This conference will take place in beautiful Kranjska Gora, Slovenia, on the dates July 13-18, 2020.

The general theme of this conference will be the mathematical topics that Paul has worked on over the years (which all have relationships to the q-Onsager algebra).  These topics include the following:

Topics in algebraic graph theory, such as distance-regular graphs, association schemes, the subconstituent algebra, and the Q-polynomial property;
Topics in linear algebra, such as Leonard pairs, tridiagonal pairs, billiard arrays, lowering-raising triples, and a linear algebraic approach to the orthogonal polynomials of the Askey scheme;
Topics in Lie theory, such as the tetrahedron algebra and the Onsager algebra;
Topics in algebras and their representations, such as the equitable presentation of U_q(sl_2), the q-tetrahedron algebra, the q-Onsager algebra in mathematical physics, and the universal Askey-Wilson algebra.
This will be a satellite conference of the European Congress of Mathematics, which will be held the prior week in Portoro┼ż, Slovenia (


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