Providence, Rhode Island, American Mathematical Society, 2021. 2 vols. XXI,516, XXI,480 pp. B./w. figs. Orig. uniform softcovers. Large 8vo. (Proceedings of symposia in pure mathematics, Vol. 103.1 & 103.2). - As new.Complete set of two volumes: Vol. I: Integrable systems; Vol. II: Quantum theories and algebraic geometry. - - This set is a collection of articles written in memory of Boris Dubrovin. The authors express their admiration for his remarkable personality and for the contribution he made to mathematical physics. For many" of the authors, Dubrovin "was a friend, a colleague, for some an inspiring mentor and teacher." "The contributions to this collection of papers are split into two volumes" which "reflect the areas of main scientific interests of Boris. Chronologically, works of Boris may be divided into several parts: integrable systems, integrable systems of hydrodynamic type, WDVV equations (a.k.a. Frobenius manifolds), isomonodromy equations (flat connections),m quantum cohomology.