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SUMMARY:Heronian Friezes - Sergey Fomin (University of Michigan\, Universi
 ty of Michigan)
DTSTART:20211112T153000Z
DTEND:20211112T160000Z
UID:TALK164821@talks.cam.ac.uk
DESCRIPTION:Exchange relations in cluster algebras of type A can be interp
 reted as Ptolemy relations for ideal quadrilaterals on the hyperbolic plan
 e. In joint work with Linus Setiabrata\, we develop a counterpart of this 
 construction in the Euclidean plane.
LOCATION:Seminar Room 1\, Newton Institute
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