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DTSTAMP:20200810T083251Z
UID:5c8a5b8a6daef647601088@ist.ac.at
DTSTART:20190904T130000
DTEND:20190904T141500
DESCRIPTION:Speaker: Sergey AVVAKUMOV\nhosted by Uli Wagner\nAbstract: Cons
ider an abstract resource $X$ and $n$ players who want to divide it among
themselves.For each possible division of $X$ each player has their favorit
e piece(s).The logic which the players use to choose the piece they like m
ay be arbitrary complicated.Can we always find an envy-free division\, i.e
.\, match players with pieces so that everyone gets a piece they like?Mode
ling $X$ as a line segment and making some natural continuity assumption p
lus an additional assumption that "something is better than nothing"\, i.e
.\, that players never like an empty piece\, Gale (1984) provedthat an env
y-free division exists for any $n$.Later it turned out that "something is
better than nothing" assumption is not necessarily essential. Without it\,
Segal-Halevi (2018) and later Meunier and Zerbib (2018) proved that an en
vy-free segment division exist for $n=3$ and $n=4$ or $n$ prime\, respecti
vely.We prove that an envy-free segment division exist for $n$ prime power
. For every $n$ not a prime power we construct an example where no envy-fr
ee division is possible. This completely solves the problem.We also discus
s what happens if $X$ is not assumed to be a line segment.Joint work with
Roman Karasev.
LOCATION:Mondi Seminar Room 3\, Central Building\, IST Austria
ORGANIZER:hwagner@ist.ac.at
SUMMARY:GeomTop Seminar: Envy-free division and degrees of equivariant maps
.
URL:https://talks-calendar.app.ist.ac.at/events/2088
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