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December 2019


Attila Joó, Base partition for finitary-cofinitary matroid families


December 19 Thursday @ 4:30 PM - 5:30 PM
Room B232, IBS (기초과학연구원)

Let ${\mathcal{M} = (M_i \colon i\in K)}$ be a finite or infinite family consisting of finitary and cofinitary matroids on a common ground set $E$. We prove the following Cantor-Bernstein-type result: if $E$ can be covered by sets ${(B_i \colon i\in K)}$ which are bases in the corresponding matroids and there are also pairwise disjoint bases of the matroids $M_i$ then $E$ can be partitioned into bases with respect to $\mathcal{M}$.

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Jaiung Jun (전재웅), The Hall algebra of the category of matroids

December 26 Thursday @ 4:30 PM - 5:30 PM
Room 1401, Bldg. E6-1, KAIST

To an abelian category A satisfying certain finiteness conditions, one can associate an algebra H_A (the Hall algebra of A) which encodes the structures of the space of extensions between objects in A. For a non-additive setting, Dyckerhoff and Kapranov introduced the notion of proto-exact categories, as a non-additive generalization of an exact category, which is shown to suffice for the construction of an associative Hall algebra. In this talk, I will discuss the category of matroids in this perspective.

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