Dear All,
Today at 15:00, there will be a Geometry seminar, for technical reasons
postponed to exam period.
Anybody can attend.
The announcement is below.
Best regards,
Pavel
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Geometry Seminar today (Tue Jan 17) at 15:00 in S9
Speaker: Jan Soukup
Improving the lower bound on opaque sets for equilateral triangle
by Taisuke Izumi
An opaque set (or a barrier) for U in the plane is a set B of finite-length
curves such that any line intersecting U also intersects B. We consider the
lower bound on the shortest barrier when U is the unit-size equilateral
triangle. In the paper they improved a general lower bound of 3/2 to
3/2+5*10^(-13).
We will also look at the case of a square instead of triangle from a different
paper where they also improved the best known lower bound.
https://www.sciencedirect.com/science/article/pii/S0166218X16302232
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Hi all,
just a reminder -- tomorrow we will have the next edition of "doktorandsky
seminar". As announced on https://kam.mff.cuni.cz/~dsemweb/, we will have
two speakers with shorter presentations:
1) Babak Ghanbari will speak about
Asymptotic equivalence of Hadwiger’s conjecture and its odd minor-variant,
a recent paper by R. Steiner about an approach to perhaps the most
important
problem in graph theory.
JCTB 2022,
https://www.sciencedirect.com/science/article/pii/S0095895622000119https://arxiv.org/abs/2109.02302
2) Matej Lieskovsky will speak about SODA 21 paper
Randomized cup game algorithms against strong adversaries
by Bender and Kuszmaul
https://dl.acm.org/doi/10.5555/3458064.3458187
Regular place&time:
Time: Thursday 9:50-12:10
Place: S8
Come to support Babak and Matej in the final seminar of this semester!
Lastly: it still may be time to enter your scheduling preferences for the
next semester -- so that you are not assigned teaching during the time of
the seminar!
R
--
Robert Šámal
IÚUK MFF UK -- CSI of Charles University