A field-independent filtration of Δ^{(n,m)} Sym^d E with layers Sym^{n+m} Sym^{d-k} E ⊗ Δ^{(n-k,m-k)} Sym^k E categorifies the Cartan product rule of U_q(sl_2).
Martínez, Michał Szwej, and Mark Wildon
2 Pith papers cite this work. Polarity classification is still indexing.
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A bivariate generating function for plethysm coefficients with bounded length(λ) is rational; for length 2 an explicit geometric algorithm exists via q-Ehrhart theory, plus linear recursions for the SL2 case.
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A field-independent filtration of plethystic modules for $\mathrm{SL}_2(\mathbb{F})$ that categorifies a product rule for the Cartan subalgebra of $\mathcal{U}_q(\mathfrak{sl}_2)$
A field-independent filtration of Δ^{(n,m)} Sym^d E with layers Sym^{n+m} Sym^{d-k} E ⊗ Δ^{(n-k,m-k)} Sym^k E categorifies the Cartan product rule of U_q(sl_2).
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A geometric and generating function approach to plethysm
A bivariate generating function for plethysm coefficients with bounded length(λ) is rational; for length 2 an explicit geometric algorithm exists via q-Ehrhart theory, plus linear recursions for the SL2 case.