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Wydział Matematyki, Informatyki i Mechaniki Uniwersytetu Warszawskiego

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Sem. Topologia Alg.


The Hochschild cohomology for abstract convexity and the Shannon entropy

Prelegent: Tomasz Maszczyk

2021-04-13 16:30

The Shannon entropy was introduced as a statistical measure of the information loss but appears in other fields of mathematics as well. We will start from the survey of the Faddeev algebraic characterization theorem and the fundamental information functional equation after Tverberg, Kendall, Lee. Next, we will sketch Gromov’s program and comment on the categorical interpretation by Baez-Fritz-Leinster. After this introduction, we plan to sketch the relations with polylogarithms and motives after Cathelineau, Dupont, Bloch, Goncharov, Elbaz-Vincent-Gangl, a cohomological interpretation by Kontsevich, and the information cohomology after Baudot-Bennequin. In the latter approach, Shannon’s entropy is a one-cocycle. Finally, we plan to present another cohomological derivation of Shannon’s entropy based on a new kind of Hochschild cohomology we construct for abstract convexity. The latter admits a cohomological interpretation of extensions of convex bodies by vector spaces parallel to Hochschild extensions of associative algebras by a square-zero ideal. Now, the Shannon entropy arises as a two-cocycle which can be understood as an analog of a first Chern class of the one-cocycle from information cohomology.