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Apr 6, 2020 at 16:23 comment added Tom Copeland Thanks. I'm continually exploring the interplay of umbral calculus/Sheffer sequences, encompassing symmetric polynomials; operator calculus, particularly vectors of the form $g(x)d/dx$; combinatorics; geometry/topology, including trees, graphs, simplicial complexes, polytopes, Riemann surfaces, and differential manifolds; and associated physics, particularly quantum field theory--rather broad interests.
Apr 3, 2020 at 23:20 history answered Vladimir Dotsenko CC BY-SA 4.0