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SUMMARY:Vladimir Rubtsov (Université d'Angers)
DTSTART:20251210T162000Z
DTEND:20251210T180000Z
DTSTAMP:20260423T023018Z
UID:GDEq/148
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/GDEq/148/">K
 ällén function and around. Part 2</a>\nby Vladimir Rubtsov (Université 
 d'Angers) as part of Geometry of differential equations seminar\n\n\nAbstr
 act\nA continuation of the talk <a href="https://researchseminars.org/talk
 /GDEq/142/">on 22 October</a>.\n\nThere 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).\n\nOriginally arising in "sc
 hool-textbooks" mathematics\, the Källén function was later "rediscovere
 d" by physicists in the context of scattering amplitude calculations. It i
 s directly connected with the famous combinatorial generating functions (f
 or the Catalan numbers)\, appears in the study of solutions of classical O
 DEs\, and is related to the generalized hypergeometric functions of Appell
  and Kampé de Fériet as well as to properties of discriminants.\n\nI wil
 l try to tell some stories around of this remarkable function.\n
LOCATION:https://researchseminars.org/talk/GDEq/148/
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