Abstract
The paper contains results that characterize the Donkin–Koppinen filtration of the coordinate superalgebra K[G] of the general linear supergroup G = GL(m|n) by its subsupermodules CΓ = OΓ(K[G]). Here, the supermodule CΓ is the largest subsupermodule of K[G] whose composition factors are irreducible supermodules of highest weight ⋋, where ⋋ belongs to a finitely-generated ideal Γ of the poset X(T)+ of dominant weights of G. A decomposition of G as a product of subsuperschemes U–×Gev×U+ induces a superalgebra isomorphism ϕ* K[U–]⊗K[Gev]⊗K[U+]≃K[G]. We show that CΓ=ϕ*(K[U–]⊗MΓK[U+]), where MΓ=OΓ(K[Gev]). Using the basis of the module MΓ, given by generalized bideterminants, we describe a basis of CΓ.
Since each CΓ is a subsupercoalgebra of K[G], its dual \( {C}_{\Gamma}^{\ast }={S}_{\Gamma} \) is a (pseudocompact) superalgebra called the generalized Schur superalgebra. There is a natural superalgebra morphism πΓ : Dist(G) → SΓ such that the image of the distribution algebra Dist(G) is dense in SΓ. For the ideal \( X{(T)}_l^{+}, \) of all weights of fixed length l, the generators of the kernel of \( {\uppi}_{X{(T)}_l^{+}} \) are described.
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A. N. Zubkov is the work was supported by the UAEU grant G00003324.
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MARKO, F., ZUBKOV, A.N. DONKIN–KOPPINEN FILTRATION FOR GL(m|n) AND GENERALIZED SCHUR SUPERALGEBRAS. Transformation Groups 28, 911–949 (2023). https://doi.org/10.1007/s00031-022-09714-y
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DOI: https://doi.org/10.1007/s00031-022-09714-y