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• 12:45, 3 November 2025 Verbovet talk contribs created page Seminar talk, 10 December 2025 (Created page with "{{Talk | speaker = Vladimir Rubtsov | title = Källén function and around. Part 2 | abstract = A continuation of the talk on 22 October. There are elementary functions that turn out to be ubiquitous. The Källén function is one of them. Of course, it is incomparably less well-known than the exponential function (although, in a certain sense, it is related to it). Originally arising in "school-textbooks" mathematics, the Källén fun...")