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X-WR-CALNAME;VALUE=TEXT:Ical
BEGIN:VTIMEZONE
TZID:Asia/Jerusalem
BEGIN:STANDARD
DTSTART:20191027T020000
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
TZNAME:IST
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:20190329T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
TZNAME:IDT
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:calendar.83885.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20190517T050018Z
DESCRIPTION:Date: \n\n12:00pm to 1:00pm\n\n\n\n\nSee also: Dynamics Lunch
\, Events & Seminars\, Seminars\n\n\nPartially based on the paper 'The Mar
koff Group of Transformations in Prime and Composite Moduli' by Meiri and
Puder.\n\n Export\n \n\n \nsubscribe iCal
DTSTART;TZID=Asia/Jerusalem:20190625T120000
DTEND;TZID=Asia/Jerusalem:20190625T130000
LAST-MODIFIED:20190609T220005Z
SUMMARY:Dynamics Lunch: Michael Chapman ״Markoff triples״
URL;TYPE=URI:https://mathematics.huji.ac.il/event/dynamics-lunch-michael-ch
apman
END:VEVENT
BEGIN:VEVENT
UID:calendar.80583.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20190318T000011Z
DESCRIPTION:Date: \n\n11:00am to 1:00pm\n\n\n\n\nSee also: Logic\, Events
& Seminars\, SeminarsLocation: \n\nRoss 63\n\n Export\n \n\n \nsubscri
be iCal
DTSTART;TZID=Asia/Jerusalem:20190626T110000
DTEND;TZID=Asia/Jerusalem:20190626T130000
LAST-MODIFIED:20190318T000011Z
SUMMARY:Logic Seminar - tba
URL;TYPE=URI:https://mathematics.huji.ac.il/event/logic-seminar-tba
END:VEVENT
BEGIN:VEVENT
UID:calendar.85556.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20190610T050013Z
DESCRIPTION:Date: \n\n12:00pm to 1:00pm\n\n\n\n\nSee also: Analysis\, Eve
nts & Seminars\, SeminarsLocation: \n\nRoss 70\n\n\n\nTitle: The (in)compa
tibility of 3 and 5 dimensional Heisenberg geometry with Lebesgue spaces\n
\n\nAbstract: The 3-dimensional (discrete) Heisenberg geometry is the shor
test-path metric on the infinite graph whose vertex set is the integer gri
d $\Z^3$ and the neighbors of each integer vector $(a\,b\,c)$ are the fou
r integer vectors $$(a+ 1\,b\,c)\, (a- 1\,b\,c)\, (a\,b+ 1\,c+ a)\, (a\,b-
1\,c- a).$$\nAnalogously\, the $5$-dimensional (discrete) Heisenberg geom
etry is the shortest-path metric on the infinite graph whose vertex set is
the integer grid $\Z^5$ and the neighbors of each integer vector $(a\,b\,
c\,d\,e)$ are the eight integer vectors $(a\pm 1\,b\,c\,d\,e)\, (a\,b\pm
1\,c\, d\,e)\, (a\,b \,c\pm 1\,d\, e\pm a)\, (a\,b \,c\,d\pm 1\, e\pm b)$
. The purpose of this talk is to describe the culmination of a multi-decad
e effort to understand the extent to which these metric spaces can be repr
esented faithfully as subsets of an $L_p(\mu)$ space. It turns out that if
$p>1$\, then there is no qualitative difference between the answer to thi
s question in dimensions $3$ and $5$. However\, if $p=1$\, then the behavi
ors of dimensions $3$ and $5$ diverge markedly. These results rely on seve
ral ideas and tools that were introduced over the years\, and they relate
deeply to a rich variety of mathematical disciplines. They answer major o
pen questions in metric embeddings\, Lipschitz factorization\, dimension r
eduction\, and semidefinite programming. We will describe key statements a
nd ideas while highlighting the most recent step which introduces the not
ion of a foliated corona decomposition (joint work with Robert Young).\n\n
Despite the fact that our discussion is linked to a wide range of areas of
mathematics\, the talk is intended for a general audience of mathematicia
ns and theoretical computer scientists. We will not rely on any prerequisi
tes beyond an undergraduate degree in mathematics\, and all of the relevan
t background will be introduced and explained.\n\n Export\n \n\n \nsubs
cribe iCal
DTSTART;TZID=Asia/Jerusalem:20190626T120000
DTEND;TZID=Asia/Jerusalem:20190626T130000
LAST-MODIFIED:20190620T100010Z
SUMMARY:Analysis Seminar - Dvoretzky lecture - Assaf Naor 'The (in)compatib
ility of 3 and 5 dimensional Heisenberg geometry with Lebesgue spaces'
URL;TYPE=URI:https://mathematics.huji.ac.il/event/analysis-seminar-dvoretzk
y-lecture-assaf-naor
END:VEVENT
BEGIN:VEVENT
UID:calendar.86031.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20190615T050019Z
DESCRIPTION:Date: \n\n2:00pm to 4:00pm\n\n\n\n\nSee also: Number Theory &
Algebraic Geometry\, Events & Seminars\, SeminarsLocation: \n\nRoss 70\n
\n\nProf. Jared Weinstein (Boston University) will give a series of 3 talk
s titled\n\n 'Geometrization of the local Langlands program'\n\nAbstract:
The Langlands program links automorphic forms and Galois representations
(of a local or global field). In contrast\, the geometric Langlands progr
am takes a curve X over the complex numbers\, and links the moduli space o
f rank n vector bundles on X to rank n local systems on X. A beautiful pr
ogram initiated by Fargues reveals the unity of the two programs over the
field of p-adic numbers. In this program\, the role of X is played by the
Fargues-Fontaine curve. The goal of this series of lectures is to underst
and Fargues' suite of conjectures. The conjectures are a theorem in the c
ase of n = 1\, where one recovers local class field theory in a new way.\n
\n Talk 1: The Fargues-Fontaine curve\, Wednesday 26/6\, 14-15:30\n T
alk 2: The stack of vector bundles\, Sunday 31/6\, 14-15:30\n Talk 3:
Statement of the conjectures\, Monday 1/7\, 14-15:30\n\nAll three talks wi
ll be held in Ross 70.\n\n Export\n \n\n \nsubscribe iCal
DTSTART;TZID=Asia/Jerusalem:20190626T140000
DTEND;TZID=Asia/Jerusalem:20190626T160000
LAST-MODIFIED:20190615T050019Z
SUMMARY:Minicourse: Jared Weinstein (Boston University 'Geometrization of t
he local Langlands program'
URL;TYPE=URI:https://mathematics.huji.ac.il/event/minicourse-jared-weinstei
n-boston-university-geometrization-local-langlands-program-1
END:VEVENT
BEGIN:VEVENT
UID:calendar.82733.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20190501T220001Z
DESCRIPTION:Date: \n\n10:00am to 11:15am\n\n\n\n\nSee also: Groups & Dyna
mics\, Events & Seminars\, SeminarsLocation: \n\nRoss 70\n\n\nAbstract: A
Markov chain over a finite state space is said to exhibit the total variat
ion cutoff phenomenon if\, starting from some Dirac measure\, the total va
riation distance to the stationary distribution drops abruptly from near m
aximal to near zero. It is conjectured that simple random walks on the fam
ily of $k$-regular\, transitive graphs with a two sided $\epsilon$ spectra
l gap exhibit total variation cutoff (for any fixed $k$ and $\epsilon). Th
is is known to be true only in a small number of cases. In this talk we di
scuss a new family of such graphs that exhibit cutoff\, namely the $1$-ske
leton of Ramanujan complexes. This family is the first natural one -- occu
rring as Cayley graphs of $PGL(d\, q)$ -- for which the cutoff point is at
a non-optimal time. Joint work with Ori Parzanchevski.\n\n Export\n \n
\n \nsubscribe iCal
DTSTART;TZID=Asia/Jerusalem:20190627T100000
DTEND;TZID=Asia/Jerusalem:20190627T111500
LAST-MODIFIED:20190617T210007Z
SUMMARY:Group and dynamics seminar: Michael Chapman (HUJI): Cutoff on Raman
ujan complexes
URL;TYPE=URI:https://mathematics.huji.ac.il/event/group-and-dynamics-semina
r-asaf-naor-princeton
END:VEVENT
BEGIN:VEVENT
UID:calendar.86451.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20190620T200003Z
DESCRIPTION:Date: \n\n11:30am to 12:45pm\n\n\n\n\nSee also: Groups & Dyna
mics\, Events & Seminars\, Seminars\n\n\n\n\nAbstract: Ratner's celebrated
equidistribution theorem states that the trajectory of any point in a hom
ogeneous space under a unipotent flow is getting equidistributed with resp
ect to some algebraic measure. In the case where the action is horospheric
al\, one can deduce an effective equidistribution result by mixing methods
\, an idea that goes back to Margulis' thesis. When the homogeneous space
is non-compact\, one needs to impose further ``diophantine conditions'' ov
er the base point\, quantifying some recurrence rates\, in order to get a
quantified equidistribution result. \n\nIn the talk I will discuss certain
diophantine conditions\, and in particular I will show how a new Margulis
' type inequality for translates of horospherical orbits helps verify such
conditions\, leading to a quantified equidistribution result for a large
class of points\, akin to the results of A. Strombergsson dealing with SL2
case. In particular we deduce a fully effective quantitative equidistribu
tion statement for horospherical trajectories of lattices defined over num
ber fields.\n\n Export\n \n\n \nsubscribe iCal
DTSTART;TZID=Asia/Jerusalem:20190627T113000
DTEND;TZID=Asia/Jerusalem:20190627T124500
LAST-MODIFIED:20190620T200003Z
SUMMARY:Groups and Dynamics seminar: Asaf Katz (Chicago) - An application o
f Margulis' inequality to effective equidistribution.
URL;TYPE=URI:https://mathematics.huji.ac.il/event/groups-and-dynamics-semin
ar-asaf-katz-chicago-application-margulis-inequality-effective
END:VEVENT
BEGIN:VEVENT
UID:calendar.63603.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20180822T100021Z
DESCRIPTION:Date: \n\n2:30pm to 3:30pm\n\n\n\n\nSee also: Events & Semina
rs\, ColloquiumLocation: \n\nManchester Building (Hall 2)\, Hebrew Univers
ity Jerusalem\n\n\nAbstract: We will prove a sharp average-case variant of
a classical embedding theorem of John through the theory of nonlinear spe
ctral gaps. We will use this theorem to provide a new answer to questions
of Johnson and Lindenstrauss (1983) and Bourgain (1985) on metric dimensio
n reduction\, and explain how it leads to algorithms for approximate neare
st neighbor search.\n\n Export\n \n\n \nsubscribe iCal
DTSTART;TZID=Asia/Jerusalem:20190627T143000
DTEND;TZID=Asia/Jerusalem:20190627T153000
LAST-MODIFIED:20190624T040005Z
SUMMARY:Colloquium Dvoretzky lecture: Assaf Naor(Princeton) - An average Jo
hn theorem
URL;TYPE=URI:https://mathematics.huji.ac.il/event/colloquium
END:VEVENT
BEGIN:VEVENT
UID:calendar.85982.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20190612T220003Z
DESCRIPTION:Date: \n\n4:00pm to 5:15pm\n\n\n\n\nSee also: Basic Notions\,
Events & Seminars\, SeminarsLocation: \n\nRoss 70\n\n\nClassical group re
presentation theory deals with group actions on linear spaces\; we conside
r group actions on compact convex spaces\, preserving topological and conv
ex structure. We focus on irreducible actions\, and show that for a large
class of groups - including connected Lie groups - these can be determined
. There is a close connection between this and the theory of bounded harm
onic functions on symmetric spaces and their boundary values. A remarkabl
e phenomenon is the fact that for SL(2\,R)\, up to iso
morphism\, there exists a unique non-degenerate irreducible affine represe
ntation.\n\n Export\n \n\n \nsubscribe iCal
DTSTART;TZID=Asia/Jerusalem:20190627T160000
DTEND;TZID=Asia/Jerusalem:20190627T171500
LAST-MODIFIED:20190620T200003Z
SUMMARY:Basic Notions: Hillel Furstenberg (HUJI) : 'Affine (Convex) represe
ntations and harmonic functions on symmetric spaces.' Part 2
URL;TYPE=URI:https://mathematics.huji.ac.il/event/basic-notions-hillel-furs
tenberg-huji-affine-convex-representations-and-harmonic-0
END:VEVENT
BEGIN:VEVENT
UID:calendar.86030.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20190615T050019Z
DESCRIPTION:Date: \n\n2:00pm to 4:00pm\n\n\n\n\nSee also: Number Theory &
Algebraic Geometry\, Events & Seminars\, SeminarsLocation: \n\nRoss 70\n
\n\nProf. Jared Weinstein (Boston University) will give a series of 3 talk
s titled\n\n 'Geometrization of the local Langlands program'\n\nAbstract:
The Langlands program links automorphic forms and Galois representations (
of a local or global field). In contrast\, the geometric Langlands program
takes a curve X over the complex numbers\, and links the moduli space of
rank n vector bundles on X to rank n local systems on X. A beautiful progr
am initiated by Fargues reveals the unity of the two programs over the fie
ld of p-adic numbers. In this program\, the role of X is played by the Far
gues-Fontaine curve. The goal of this series of lectures is to understand
Fargues' suite of conjectures. The conjectures are a theorem in the case o
f n = 1\, where one recovers local class field theory in a new way.\n\n
Talk 1: The Fargues-Fontaine curve\, Wednesday 26/6\, 14-15:30\n Talk 2:
The stack of vector bundles\, Sunday 31/6\, 14-15:30\n Talk 3: Statemen
t of the conjectures\, Monday 1/7\, 14-15:30\n\nAll three talks will be he
ld in Ross 70.\n\n Export\n \n\n \nsubscribe iCal
DTSTART;TZID=Asia/Jerusalem:20190630T140000
DTEND;TZID=Asia/Jerusalem:20190630T160000
LAST-MODIFIED:20190615T050019Z
SUMMARY:Minicourse: Jared Weinstein (Boston University 'Geometrization of t
he local Langlands program'
URL;TYPE=URI:https://mathematics.huji.ac.il/event/minicourse-jared-weinstei
n-boston-university-geometrization-local-langlands-program-0
END:VEVENT
BEGIN:VEVENT
UID:calendar.86029.field_date.0@mathematics.huji.ac.il
DTSTAMP:20190625T093938Z
CREATED:20190615T050019Z
DESCRIPTION:Date: \n\n2:00pm to 4:00pm\n\n\n\n\nSee also: Number Theory &
Algebraic Geometry\, Events & Seminars\, SeminarsLocation: \n\nRoss 70\n
\n\nProf. Jared Weinstein (Boston University) will give a series of 3 talk
s titled\n\n 'Geometrization of the local Langlands program'\n\nAbstract:
The Langlands program links automorphic forms and Galois representations (
of a local or global field). In contrast\, the geometric Langlands program
takes a curve X over the complex numbers\, and links the moduli space of
rank n vector bundles on X to rank n local systems on X. A beautiful progr
am initiated by Fargues reveals the unity of the two programs over the fie
ld of p-adic numbers. In this program\, the role of X is played by the Far
gues-Fontaine curve. The goal of this series of lectures is to understand
Fargues' suite of conjectures. The conjectures are a theorem in the case o
f n = 1\, where one recovers local class field theory in a new way.\n\n
Talk 1: The Fargues-Fontaine curve\, Wednesday 26/6\, 14-15:30\n Talk 2:
The stack of vector bundles\, Sunday 31/6\, 14-15:30\n Talk 3: Statemen
t of the conjectures\, Monday 1/7\, 14-15:30\n\nAll three talks will be he
ld in Ross 70.\n\n Export\n \n\n \nsubscribe iCal
DTSTART;TZID=Asia/Jerusalem:20190701T140000
DTEND;TZID=Asia/Jerusalem:20190701T160000
LAST-MODIFIED:20190615T050019Z
SUMMARY:Minicourse: Jared Weinstein (Boston University 'Geometrization of t
he local Langlands program'
URL;TYPE=URI:https://mathematics.huji.ac.il/event/minicourse-jared-weinstei
n-boston-university-geometrization-local-langlands-program
END:VEVENT
END:VCALENDAR