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Generalised row and column removal phenomena and $p$-Kostka numbers
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math.RT
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algebraskostkanumbersphenomenacolumnexplainextensionformulae
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abstract
We explain and generalise row-removal phenomena for Schur algebras via isomorphisms between subquotients of these algebras. In particular, we prove a new reduction formulae for $p$-Kostka numbers and extension groups between Weyl and simple modules.
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