BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Joachim Kock (KU)
DTSTART:20220929T140000Z
DTEND:20220929T160000Z
DTSTAMP:20260422T065706Z
UID:CJCS/79
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CJCS/79/">Fr
 om Möbius inversion to renormalisation</a>\nby Joachim Kock (KU) as part 
 of Copenhagen-Jerusalem Combinatorics Seminar\n\n\nAbstract\nAlthough Möb
 ius inversion originates in number theory\, its standard formulation\, due
  to Rota\, is in the setting of posets\, where it is about splitting of in
 tervals.  It has become a standard and widely used counting device in comb
 inatorics and application areas.  The goal of the talk is to show how a sl
 ight generalisation of the Möbius inversion principle can also explain (t
 he algebraic aspect of) one of the main approaches to renormalisation of p
 erturbative quantum field theories\, the so-called BPHZ renormalisation (a
 fter Bogoliubov\, Parasiuk\, Hepp\, and Zimmerman)\, in the Hopf-algebraic
  formulation due to Kreimer. In the talk\, I will  explain all the words a
 bove. (In particular\, no prior knowledge  of physics is assumed.)\n\nDiet
 ary info: the talk does not contain category theory.\n
LOCATION:https://researchseminars.org/talk/CJCS/79/
END:VEVENT
END:VCALENDAR