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BEGIN:VEVENT
SUMMARY:Prof. Yves Benoist (University of Paris-Saclay)
DTSTART;VALUE=DATE-TIME:20201028T123000Z
DTEND;VALUE=DATE-TIME:20201028T133000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/1
DESCRIPTION:Title:
Harish-Chandra tempered representations and homogeneous spaces\nby Pro
f. Yves Benoist (University of Paris-Saclay) as part of TMC Distinguished
Lecture Series\n\n\nAbstract\nIn the seventies Harish-Chandra introduced t
he tempered representations of a semisimple real Lie group G as those that
occur in the analog on G of the Fourier-Plancherel formula. Nowadays\, th
ose representations are ubiquitous.\n\nIn this talk we will recall their d
efinition and properties and we will answer the following question:\n\nFor
which connected subgroup H\, does the analog on G/H of the Fourier-Planch
erel formula involves only tempered representations?\n
LOCATION:https://researchseminars.org/talk/tmc-dls/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Yves Benoist (University of Paris-Saclay)
DTSTART;VALUE=DATE-TIME:20201111T123000Z
DTEND;VALUE=DATE-TIME:20201111T133000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/2
DESCRIPTION:Title:
Live interactive session with the speaker\nby Prof. Yves Benoist (Univ
ersity of Paris-Saclay) as part of TMC Distinguished Lecture Series\n\n\nA
bstract\nPlease visit: https://sites.google.com/view/distinguishedlectures
eries/yves-benoist\n\nProf. Yves Benoist will discuss with participants ab
out his talk 'Harish-Chandra tempered representations and homogeneous spac
es'. Visit https://sites.google.com/view/distinguishedlectureseries/bernd-
sturmfels for details.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Bernd Sturmfels (Max Planck Institute\, Leipzig and Universi
ty of California\, Berkeley)
DTSTART;VALUE=DATE-TIME:20201118T123000Z
DTEND;VALUE=DATE-TIME:20201118T131500Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/3
DESCRIPTION:Title:
3264 Conics in a Second\nby Prof. Bernd Sturmfels (Max Planck Institut
e\, Leipzig and University of California\, Berkeley) as part of TMC Distin
guished Lecture Series\n\n\nAbstract\nThis seminar spans a bridge between
19th century geometry to 21st century computing. We start with a classical
theme that was featured in the January 2020 issue of the Notices of the A
merican Mathematical Society\, namely the 3264 conics that are tangent to
five given conics in the plane. We discuss the computation of these conics
\, by solving a system of polynomial equations with numerical methods that
are fast and reliable. In our discussion we will focus on the role of app
lied algebraic geometry in statistics and optimization\, starting from the
role of linear spaces of symmetric matrices (LSSM) for Gaussian models an
d semidefinite programming.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Bernd Sturmfels (Max Planck Institute\, Leipzig and Universi
ty of California\, Berkeley)
DTSTART;VALUE=DATE-TIME:20201207T123000Z
DTEND;VALUE=DATE-TIME:20201207T133000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/4
DESCRIPTION:Title:
Live interactive session with the speaker\nby Prof. Bernd Sturmfels (M
ax Planck Institute\, Leipzig and University of California\, Berkeley) as
part of TMC Distinguished Lecture Series\n\n\nAbstract\nPlease visit: http
s://sites.google.com/view/distinguishedlectureseries/bernd-sturmfels\n\nPr
of. Bernd Sturmfels will discuss with participants about his talk '3264 Co
nics in a Second'. Visit https://sites.google.com/view/distinguishedlectur
eseries/bernd-sturmfels for details.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Nalini Anantharaman (University of Strasbourg)
DTSTART;VALUE=DATE-TIME:20201209T123000Z
DTEND;VALUE=DATE-TIME:20201209T133000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/5
DESCRIPTION:Title:
Uncertainty principle and uncertainty inequalities\nby Prof. Nalini An
antharaman (University of Strasbourg) as part of TMC Distinguished Lecture
Series\n\n\nAbstract\nWe shall discuss mathematical forms of the uncertai
nty principle and its relationship with quantum unique ergodicity.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Nalini Anantharaman (University of Strasbourg)
DTSTART;VALUE=DATE-TIME:20201222T123000Z
DTEND;VALUE=DATE-TIME:20201222T133000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/6
DESCRIPTION:Title:
Live interactive session with the speaker\nby Prof. Nalini Anantharama
n (University of Strasbourg) as part of TMC Distinguished Lecture Series\n
\n\nAbstract\nhttps://sites.google.com/view/distinguishedlectureseries/nal
ini-anantharaman\n\nProf. Nalini Anantharaman will discuss with participan
ts about her talk 'Uncertainty principle and uncertainty inequalities'. Vi
sit https://sites.google.com/view/distinguishedlectureseries/nalini-ananth
araman for details.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Alex Lubotzky (Einstein Institute of Mathematics\, Hebrew Un
iversity)
DTSTART;VALUE=DATE-TIME:20210113T123000Z
DTEND;VALUE=DATE-TIME:20210113T133000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/7
DESCRIPTION:Title:
Stability\, non-approximate groups\, and high dimensional expanders\nb
y Prof. Alex Lubotzky (Einstein Institute of Mathematics\, Hebrew Universi
ty) as part of TMC Distinguished Lecture Series\n\n\nAbstract\nSeveral wel
l-known open questions (such as: are all groups sofic or hyperlinear?) hav
e a common form: can all groups be approximated by asymptotic homomorphism
s into the symmetric groups Sym(n) (in the sofic case) or the unitary grou
ps U(n) (in the hyperlinear case)?\nIn the case of U(n)\, the question can
be asked with respect to different metrics and norms. We answer\, for the
first time\, one of these versions\, showing that there exist finitely pr
esented groups which are not approximated by U(n) with respect to the Frob
enius (=L2) norm.\nThe strategy is via the notion of 'stability': some hi
gher dimensional cohomology vanishing phenomena is proven to imply stabili
ty and using higher dimensional expanders\, it is shown that some non-resi
dually finite groups (central extensions of some lattices in p-adic Lie gr
oups) are Frobenious stable and hence cannot be Frobenius approximated.\nA
ll notions will be explained. Joint work with M. De Chiffre\, L. Glebsky a
nd A. Thom.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Alex Lubotzky (Einstein Institute of Mathematics\, Hebrew Un
iversity)
DTSTART;VALUE=DATE-TIME:20210127T123000Z
DTEND;VALUE=DATE-TIME:20210127T133000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/8
DESCRIPTION:Title:
Live interactive session with the speaker\nby Prof. Alex Lubotzky (Ein
stein Institute of Mathematics\, Hebrew University) as part of TMC Disting
uished Lecture Series\n\n\nAbstract\nhttps://sites.google.com/view/disting
uishedlectureseries/alex-lubotzky\n\nProf. Alex Lubotzky will discuss with
participants about his talk 'Stability\, non-approximate groups\, and hig
h dimensional expanders'. Visit https://sites.google.com/view/distinguishe
dlectureseries/alex-lubotzky for details.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Scott Sheffield (Massachusetts Institute of Technology)
DTSTART;VALUE=DATE-TIME:20210210T123000Z
DTEND;VALUE=DATE-TIME:20210210T133000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/9
DESCRIPTION:Title:
Pandemics and paradox\nby Prof. Scott Sheffield (Massachusetts Institu
te of Technology) as part of TMC Distinguished Lecture Series\n\n\nAbstrac
t\nIn one of the simplest epidemic models\, one lets p_n denote the number
of new infections during week n and assumes that (during the early stages
of the epidemic) p_{n+1} = R_0 p_n c_n where c_n measures the “frac
tion of usual contact” that takes place between people during the nth we
ek. Within this simplistic model\, intermittent strategies (taking c_n s
mall some weeks and large other weeks) lead to lower infection rates than
consistent strategies with the same total amount of contact.\n\nBut what h
appens in more life-like models (such as SEIR and its network-based varian
ts)? What factors cause intermittent strategies to outperform consistent s
trategies? What changes when there are multiple subpopulations with differ
ent controls? I will discuss some work with public health researchers that
explores these questions for simple examples. Some of the models are coun
terintuitive: the strategy one expects to be “best possible” turns out
to be “worst possible” and vice versa.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Scott Sheffield (Massachusetts Institute of Technology)
DTSTART;VALUE=DATE-TIME:20210224T123000Z
DTEND;VALUE=DATE-TIME:20210224T133000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/10
DESCRIPTION:Title: Live interactive session with the speaker\nby Prof. Scott Sheffield (
Massachusetts Institute of Technology) as part of TMC Distinguished Lectur
e Series\n\n\nAbstract\nhttps://sites.google.com/view/distinguishedlecture
series/scott-sheffield\n\nProf. Scott Sheffield will discuss with particip
ants about his talk 'Pandemics and paradox'. Visit https://sites.google.co
m/view/distinguishedlectureseries/scott-sheffield for details.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Karen E. Smith (University of Michigan)
DTSTART;VALUE=DATE-TIME:20210408T130000Z
DTEND;VALUE=DATE-TIME:20210408T150000Z
DTSTAMP;VALUE=DATE-TIME:20210419T101216Z
UID:tmc-dls/11
DESCRIPTION:Title: Extremal singularities in prime characteristic\nby Prof. Karen E. Smi
th (University of Michigan) as part of TMC Distinguished Lecture Series\n\
n\nAbstract\nWhat is the most singular possible singularity? What can we s
ay about its geometric and algebraic properties? This seemingly naive ques
tion has a sensible answer in characteristic p. The "F-pure threshold\," w
hich is an analog of the log canonical threshold\, can be used to "measure
" how bad a singularity is. The F-pure threshold is a numerical invariant
of a point on (say) a hypersurface---a positive rational number that is 1
at any smooth point (or more generally\, any F-pure point) but less than o
ne in general\, with "more singular" points having smaller F-pure threshol
ds. We explain a recently proved lower bound on the F-pure threshold in te
rms of the multiplicity of the singularity. We also show that there is a n
ice class of hypersurfaces---which we call "Extremal hypersurfaces"---for
which this bound is achieved. These have very nice (extreme!) geometric pr
operties. For example\, the affine cone over a non Frobenius split cubic s
urface of characteristic two is one example of an "extremal singularity".
Geometrically\, these are the only cubic surfaces with the property that *
every* triple of coplanar lines on the surface meets in a single point (ra
ther than a "triangle" as expected)---a very extreme property indeed.\n\nP
rof. Karen E. Smith will deliver a live talk on April 08\, 2021 at 18:30 I
ndian time. This talk will be followed by a live interactive session with
the speaker.\n
LOCATION:https://researchseminars.org/talk/tmc-dls/11/
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