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Ext-groups of graded comodules
Let $Γ$ be a coalgebra over a field. There is a well-known covariant embedding of the category of graded $Γ$-comodules into the category of graded modules over the dual algebra $Γ^*$. We show that this covariant embedding preserves Ext-groups in a range of motivating cases, including in some cases l
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