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Feb 17, 2022 at 15:36 comment added Tom Copeland See intro to "Exponential Formulas, Normal Ordering and the Weyl-Heisenberg Algebra" by Stjepan Meljanac and Rina Štrajn arxiv.org/abs/2105.12593
Dec 18, 2021 at 19:43 history edited Tom Copeland CC BY-SA 4.0
Applications to monstrous moonshine
Jan 23, 2020 at 17:58 comment added Tom Copeland See also the intro to the survey "Lessons from Quantum Field Theory: Hopf Algebras and Spacetime Geometries" by Connes and Kreimer (arxiv.org/abs/hep-th/9904044). Vector fields and the Witt algebra related to the generators $-x^{n+1}d/dx$ are central. Also see "Cyclic cohomology and Hopf algebras" by Connes and Moscovici (arxiv.org/abs/math/9904154)
Jan 23, 2020 at 1:45 history answered Tom Copeland CC BY-SA 4.0