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math.KT2025
Comparison of Cohomological and K-theoretical Hall algebra
Felix Küng, Špela Špenko
We give a more conceptual construction of a comparison algebra morphism from the K-theoretical Hall algebra to a twist of the cohomological Hall algebra associated to a symmetric q…
math.KT2024
Algebraic for unpointed homotopy Categories
Felix Küng
We introduce the notion of Grothendieck heaps for unpointed Waldhausen categories and unpointed stable -categories. This allows an extension of the studies of $\mathrm{K}_0…
math.KT2023
Algebraic K for unpointed Categories
Felix Küng
We construct a natural generalization of the Grothendieck group to the case of possibly unpointed categories admitting pushouts by using the concept of heaps recentl…