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TZID:Asia/Jerusalem
BEGIN:STANDARD
DTSTART:20201025T020000
TZOFFSETFROM:+0300
TZOFFSETTO:+0200
RDATE:20211031T020000
TZNAME:IST
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BEGIN:DAYLIGHT
DTSTART:20210326T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0300
TZNAME:IDT
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BEGIN:VEVENT
UID:calendar.2762717.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210307T200009Z
DESCRIPTION:Date: \n\n12:00pm  to  2:00pm\nRepeats every week every Sunday 
 until Wed Jun 30 2021 except Sun Mar 28 2021 \n\n\nSee also: Kazhdan Sunda
 y Seminars\, Events & Seminars\, Seminars\n\n\nDear all\,In the upcoming s
 pring term\, I will give a course on Riemannian geometry of diffeomorphism
  groups (80833)\, as part of Kazhdan Sunday seminars. It will take place o
 n Sundays\, 12–14\, starting next week (March 14)\, via zoom (link: https:
 //huji.zoom.us/j/88976026563?pwd=WEw3OHpOUUtBNFlQUUk2UGdteXNRZz09). After 
 Passover\, it may continue in class (Ross 70A)\, with a live broadcast.The
  course will cover the following topics:1. Introduction to infinite dimens
 ional Riemannian geometry — what extends from 'standard' Riemannian geomet
 ry and what does not.2. Spaces and metrics of interest — relation between 
 geodesic equations on diffeomorphism groups and hydrodynamics.3. Metric pr
 operties of diffeomorphism groups — vanishing distance phenomenon\, diamet
 er\, metric completeness.4. Geodesic equations — short time existence\, re
 gularity of geodesics (following Ebin–Marsden)\, geodesic completeness.I w
 ill assume some basic knowledge in functional analysis and (finite dimensi
 onal) Riemannian geometry (in the level of the basic notions courses of ou
 r department).If you are interested in joining the mailing list of the cou
 rse (for announcements\, notes\, etc.)\, please fill in your email address
  in the following google form:https://docs.google.com/forms/d/e/1FAIpQLSdD
 4ZxzrtKfHXQyJbSPgOpWuG2JjJwPz31RptKhCZbDgaoEIw/viewformHope to see you nex
 t week\,Cy\n12:00pm  to  2:00pm\nRepeats every week every Sunday until Wed
  Jun 30 2021 except Sun Mar 28 2021
DTSTART;TZID=Asia/Jerusalem:20210314T120000
DTEND;TZID=Asia/Jerusalem:20210314T140000
EXDATE;TZID=Asia/Jerusalem:20210328T120000
LAST-MODIFIED:20210311T220026Z
RRULE:FREQ=WEEKLY;UNTIL=20210630T175959Z;INTERVAL=1;BYDAY=SU;WKST=SU
SUMMARY:Kazhdan seminar: Cy Maor 'Riemannian geometry of diffeomorphism gro
 ups'
URL;TYPE=URI:https://mathematics.huji.ac.il/event/kazhdan-seminar-cy-maor-r
 iemannian-geometry-diffeomorphism-groups
END:VEVENT
BEGIN:VEVENT
UID:calendar.2762714.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210307T200009Z
DESCRIPTION:Date: \n\n3:00pm  to  5:00pm\nRepeats every week every Sunday u
 ntil Wed Jun 30 2021 except Sun Mar 28 2021 \n\n\nSee also: Kazhdan Sunday
  Seminars\, Events & Seminars\, Seminars\n\n\nIn the upcoming spring term\
 ,  Joseph Bernstein and Erez Lapid will give a course on 'Eisenstein serie
 s and spectral theory of automorphic forms'\, as part of Kazhdan Sunday se
 minars. It will take place on Sundays\, 15–17\, starting next week (March 
 14)\, via zoom: https://huji.zoom.us/j/86838255753?pwd=aUIva2sycDJoL1ZsSG8
 vWHBlMSsxUT09Meeting ID: 868 3825 5753Passcode: 745302  After Passover\, t
 he current plan is to continue in class (Ross 70A)\, with a live broadcast
 .Those of you who would like to be added to the mailing list and get furth
 er announcements are requested  to complete the following form: https://fo
 rms.gle/V3kERKWJ5cWriFty5Abstract: The theory of Eisenstein series is cent
 ral to the spectral theory of locally symmetric spaces\, which was develop
 ed by Selberg and Langlands in the 1950s and 1960s. We will explain a diff
 erent approach for both the meromorphic continuation of Eisenstein series 
 and spectral theory. This goes back to ideas from the 1980s.References:1) 
 Bernstein-Lapid 'On the meromorphic continuation of Eisenstein series'    
 https://arxiv.org/abs/1911.023422) Sakellaridis-Venkatesh: Periods and har
 monic analysis on spherical varieties\, Astérisque #396 (2017)3)  Bernstei
 n\,  'On the support of Plancherel measure'\, J. Geom. Phys. 5 (1988)  \n3
 :00pm  to  5:00pm\nRepeats every week every Sunday until Wed Jun 30 2021 e
 xcept Sun Mar 28 2021
DTSTART;TZID=Asia/Jerusalem:20210314T150000
DTEND;TZID=Asia/Jerusalem:20210314T170000
EXDATE;TZID=Asia/Jerusalem:20210328T150000
LAST-MODIFIED:20210315T220020Z
RRULE:FREQ=WEEKLY;UNTIL=20210630T175959Z;INTERVAL=1;BYDAY=SU;WKST=SU
SUMMARY:Kazhdan seminar: Joseph Bernstein and Erez Lapid 'Eisenstein series
  and spectral theory of automorphic forms'
URL;TYPE=URI:https://mathematics.huji.ac.il/event/kazhdan-seminar-joseph-be
 rnstein-and-erez-lapid-eisenstein-series-and-spectral-theory
END:VEVENT
BEGIN:VEVENT
UID:calendar.2882503.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210327T100047Z
DESCRIPTION:Date: \n\n10:30am  to  12:30pm\n\n\nSee also: Combinatorics\, S
 eminars\, Events & SeminarsLocation: \n\nhttps://huji.zoom.us/j/8329281577
 0?pwd=SnlPbXR1aTlWVHZEWWFVSEZjUmRmZz09\n\n\nHUJI Combinatorics Seminar Whe
 n: Monday April 19th\, 2021\, at 10:30AMZoom link: https://huji.zoom.us/j/
 83292815770?pwd=SnlPbXR1aTlWVHZEWWFVSEZjUmRmZz09Speaker:  Amitay Kamber (H
 UJI)Title: Combinatorics via Closed Orbits: Vertex Expansion and Graph Qua
 ntum ErgodicityAbstract: A Lossless expander is a d-regular graph such tha
 t small sets with m vertices have close to dm neighbors. Explicit construc
 tion of a family of such graphs will have a lot of applications– for examp
 le\, they are unique neighbor expanders. It is believed is that the Ramanu
 jan graph (i.e.\, graphs with an optimal spectral gap) that are constructe
 d from number theory\, such as the celebrated graphs of Lubotzky\, Phillip
 s\, and Sarnak\, are lossless expanders. We show that this belief is actua
 lly false – one can construct arithmetic Ramanujan graphs with a small sub
 set having no unique neighbors. Our graphs also have an eigenfunction of t
 he adjacency operator of small support\, again contradicting common expect
 ations in the field of graph quantum ergodicity.The construction is based 
 on a general method of constructing extremal combinatorial objects from cl
 osed orbits of subgroups of semisimple p-adic groups. Similar ideas are ve
 ry common in number theory and homogeneous dynamics\, and we introduce the
 m to combinatorics.Joint work with Tali Kaufman.\n\nAdd to Calendar\nOutlo
 okGoogle
DTSTART;TZID=Asia/Jerusalem:20210419T103000
DTEND;TZID=Asia/Jerusalem:20210419T123000
LAST-MODIFIED:20210417T100021Z
SUMMARY:Combinatorics: Amitay Kamber (HUJI)
URL;TYPE=URI:https://mathematics.huji.ac.il/event/combinatorics-amitay-kamb
 er-huji
END:VEVENT
BEGIN:VEVENT
UID:calendar.2963857.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210412T060045Z
DESCRIPTION:Date: \n\n1:00pm  to  2:00pm\nRepeats every week every Monday u
 ntil Wed Jun 30 2021 except Mon May 17 2021 \n\n\nSee also: Number Theory 
 & Algebraic Geometry\, Events & Seminars\, SeminarsLocation: \n\nRoss 70  
 &  ZOOM\n\n\nNext meeting:  Mon\, 12 April 2021\, 13-14 Speaker: Shaul Zem
 elTitle:  Hecke operators Place:  Ross 70  with a live broadcast via  ZOOM
  https://huji.zoom.us/j/86725837215?pwd=bmh3VTg3UlhvejQ1bkFiYlZ2OTN6UT09Me
 eting ID: 867 2583 7215Passcode: 620671-----------------------------------
 ----------------------------------------------------------------All the in
 formation about the seminar will appear on Ari's website:http://math.huji.
 ac.il/~shnidman/Lunchseminars.htmland moodle page https://moodle2.cs.huji.
 ac.il/nu20/course/view.php?id=80943---------------------------------------
 --------------------------------------------------------------------------
 -----------Dear all\, The Number Theory-Algebraic Geometry 'lunch' seminar
  (80943) this semester will be a student's learning seminar on Galois repr
 esentations and modular forms Our intention is to make accessible to motiv
 ated master and PhD students\, and that most of talks will  be given by st
 udents or post-docs. HUJI students can register and get a credit for this.
  Students with background in either number theory or algebraic geometry ar
 e encouraged to attend\, and especially encouraged to give talks. Please c
 ontact one of us if you are interested in giving a talk.  Best\,Ari and Ya
 kov. ---------------------------------------------------------------------
 -----------------------Description: The ultimate goal for the semester is 
 to understand Deligne's construction of Galois representations associated 
 with modular forms of even weight.  We will start at the beginning\, by de
 fining modular forms\, modular curves\, Hecke operators\, and then discuss
  Galois representations\, L-functions\, and the Eichler-Shimura relation. 
 We will use the geometry of modular curves\, and the formalism of etale co
 homology (which we will go over)\, to attach a Galois representation to ea
 ch modular form of even weight\, so that the L-function of the Galois repr
 esentation agrees with the L-function of the modular form.References: Our 
 main reference will be https://www.math.wisc.edu/~boston/Diamond-Im-Modula
 r_forms_and_modular_curves.pdf\n1:00pm  to  2:00pm\nRepeats every week eve
 ry Monday until Wed Jun 30 2021 except Mon May 17 2021
DTSTART;TZID=Asia/Jerusalem:20210412T130000
DTEND;TZID=Asia/Jerusalem:20210412T140000
EXDATE;TZID=Asia/Jerusalem:20210517T130000
LAST-MODIFIED:20210412T060045Z
RRULE:FREQ=WEEKLY;UNTIL=20210630T175959Z;INTERVAL=1;BYDAY=MO;WKST=SU
SUMMARY:The NT-AG 'lunch' seminar: Shaul Zemel 'Hecke operators'
URL;TYPE=URI:https://mathematics.huji.ac.il/event/nt-ag-lunch-seminar-shaul
 -zemel-hecke-operators
END:VEVENT
BEGIN:VEVENT
UID:calendar.2669419.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210218T070005Z
DESCRIPTION:Date: \n\n2:00pm  to  4:00pm\n\n\nSee also: Seminars\, Events &
  Seminars\, Number Theory HUJI-BGULocation: \n\nhttps://us02web.zoom.us/j/
 81568648940?pwd=cVNVa2tpUHM5aDBIaDF6eXpiaHUzZz09\n\n\nThe meeting will be 
 open from 14.15 (local time) for a virtual coffee with the speaker. \n\nJo
 in Zoom Meeting\n\nhttps://us02web.zoom.us/j/81568648940?pwd=cVNVa2tpUHM5a
 DBIaDF6eXpiaHUzZz09\n\nMeeting ID: 815 6864 8940\n\nPasscode: 3628800\n\nA
 dd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210419T140000
DTEND;TZID=Asia/Jerusalem:20210419T160000
LAST-MODIFIED:20210418T050233Z
SUMMARY:Jef Laga [HUJI-BGU Number Theory Seminar]
URL;TYPE=URI:https://mathematics.huji.ac.il/event/giuseppe-ancona-huji-bgu-
 number-theory-seminar
END:VEVENT
BEGIN:VEVENT
UID:calendar.2526636.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210125T070008Z
DESCRIPTION:Date: \n\n2:00pm  to  3:00pm\n\n\nSee also: Dynamical & Probabi
 lity\, Events & Seminars\, Seminars\n\n\nAbstract: Can one relate random w
 alks on a group with random walks on a dense subgroup of it? We develop a 
 technique to do it in some cases. This allows us to exhibit some new inter
 esting phenomena in Furstenberg-Poisson Boundary Theory. \nJoint work with
  Michael Björklund and Hanna Oppelmayer\n\nAdd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210420T140000
DTEND;TZID=Asia/Jerusalem:20210420T150000
LAST-MODIFIED:20210417T070027Z
SUMMARY:Dynamics seminar: Yair Hartman (BGU) Random walks and dense subgrou
 ps
URL;TYPE=URI:https://mathematics.huji.ac.il/event/dynamics-seminar-yair-har
 tman-bgu
END:VEVENT
BEGIN:VEVENT
UID:calendar.2936242.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210406T060011Z
DESCRIPTION:Date: \n\n6:00pm  to  7:00pm\n\n\nSee also: Topology & Geometry
 \, Seminars\, Events & Seminars\n\n\nWe consider the space of Kahler metri
 cs on a compact Kahler manifold. This space is an infinite dimensional man
 ifold\, and admits many natural quantities describing its geometry. For ex
 ample\, it is known that the L^1 Finsler metric on this space has asymptot
 ic growth comparable to the so-called J functional. We obtain sharp inequa
 lities between the large scale asymptotic of the J functional with respect
  to this L^1 metric. Applications regarding the initial value problem for 
 Mabuchi geodesic rays are presented (joint with K. Smith and E. George). 
 \n\nAdd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210420T180000
DTEND;TZID=Asia/Jerusalem:20210420T190000
LAST-MODIFIED:20210408T220017Z
SUMMARY:T&G: Tamas Darvas (University of Maryland)\, Optimal asymptotic of 
 the J functional with respect to the d_1 metric
URL;TYPE=URI:https://mathematics.huji.ac.il/event/tg-tamas-darvas-universit
 y-maryland-optimal-asymptotic-j-functional-respect-d1-metric
END:VEVENT
BEGIN:VEVENT
UID:calendar.2540348.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210127T200011Z
DESCRIPTION:Date: \n\n12:00pm  to  1:00pm\n\n\nSee also: Analysis\, Events 
 & Seminars\, Seminars\n\n\nLocation: Ross 70A and Zoomhttps://huji.zoom.us
 /j/88693310302?pwd=cjZDOWhhMmJSaFVrdHhMZ0JlOVRHUT09Title: Non-Euclidean el
 asticity: Embedding manifolds with minimal distortionAbstract: Given two d
 imensional Riemannian manifolds $M\,N$\, I will present a sharp lower boun
 d on the elastic energy (distortion) of embeddings $f:M \to N$\, in terms 
 of the areas' discrepancy of $M\,N$.The minimizing maps attaining this bou
 nd go through a phase transition when the ratio of areas is $1/4$: The hom
 otheties are the unique energy minimizers when the ratio $\frac{V_N}{V_M} 
 \ge 1/4$\, and they cease being minimizers when $\frac{V_N}{V_M}$ gets bel
 ow $1/4$.I will describe explicit minimizers in the non-trivial regime $\f
 rac{V_N}{V_M} < 1/4$ when $M\,N$ are disks\, and give a proof sketch of th
 e lower bound. If time permits\, I will discuss the stability of minimizer
 s.\n\nAdd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210421T120000
DTEND;TZID=Asia/Jerusalem:20210421T130000
LAST-MODIFIED:20210415T110309Z
SUMMARY:Analysis Seminar: Asaf Shachar (HUJI) — Non-Euclidean elasticity: E
 mbedding manifolds with minimal distortion
URL;TYPE=URI:https://mathematics.huji.ac.il/event/analysis-seminar-asaf-sha
 char-huji
END:VEVENT
BEGIN:VEVENT
UID:calendar.2950174.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210408T210014Z
DESCRIPTION:Date: \n\n12:00pm  to  1:30pm\n\n\nSee also: Amitsur Algebra\, 
 Seminars\, Events & Seminars\n\n\nTitle:Non-stability of $Z^2$ and group c
 ohomologyAbstract: Given two unitary matrices that almost commute\, is it 
 necessarily the case that they are close to two exactly commuting unitary 
 matrices? It turns out that the answer depends on the matrix norm one work
 s with. We introduce the study of the stability of a group with respect to
  a matrix norm\, and the connection of this question with the stability of
  $Z^2$. We prove that for the $p$-Schetten norm\, the answer is negative\,
  and present a newer\, conceptual proof using group cohomology.\n\nAdd to 
 Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210422T120000
DTEND;TZID=Asia/Jerusalem:20210422T133000
LAST-MODIFIED:20210413T190020Z
SUMMARY:Amitsur seminar:  Benjamin Bachner (HUJI)\, Sprinzak 116
URL;TYPE=URI:https://mathematics.huji.ac.il/event/amitsur-seminar-benjamin-
 bachner-huji
END:VEVENT
BEGIN:VEVENT
UID:calendar.2616377.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210209T090006Z
DESCRIPTION:Date: \n\n2:00pm  to  3:00pm\n\n\nSee also: Dynamical & Probabi
 lity\, Events & Seminars\, Seminars\n\nAdd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210427T140000
DTEND;TZID=Asia/Jerusalem:20210427T150000
LAST-MODIFIED:20210209T090006Z
SUMMARY:Dynamics seminar: Uri Bader (WIS)
URL;TYPE=URI:https://mathematics.huji.ac.il/event/dynamics-seminar-uri-bade
 r-wis
END:VEVENT
BEGIN:VEVENT
UID:calendar.2616380.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210209T090014Z
DESCRIPTION:Date: \n\n12:00pm  to  1:00pm\n\n\nSee also: Analysis\, Events 
 & Seminars\, Seminars\n\nAdd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210428T120000
DTEND;TZID=Asia/Jerusalem:20210428T130000
LAST-MODIFIED:20210209T090014Z
SUMMARY:Analysis Seminar: Roee Leder (HUJI)
URL;TYPE=URI:https://mathematics.huji.ac.il/event/analysis-seminar-roee-led
 er-huji
END:VEVENT
BEGIN:VEVENT
UID:calendar.2855661.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210324T110023Z
DESCRIPTION:Date: \n\n4:00pm  to  5:00pm\n\n\nSee also: Analysis\, Events &
  Seminars\, Seminars\n\n\n\nTitle: Lateral variation principle and extrema
  of dispersion relation of periodic graphs \nAbstract: The first step in t
 he proofs of several spectral geometry theorems is perturbing the operator
  ``along'' a given eigenfunction $f$\, i.e. adding a perturbation $P$ that
  vanishes on $f$ and therefore leaves the corresponding eigenvalue $\lambd
 a_0$ in its place. But such perturbation may still affect the sequential n
 umber of $\lambda_0$ in the spectrum\, creating a spectral shift. We will 
 discuss a general theorem that recovers the value of the spectral shift by
  looking at the stability of $\lambda_0$ with respect to small variations 
 of the perturbation $P$. As an application of this result\, we show that a
  large family of tight-binding models have a curious property: any local e
 xtremum of a given sheet of the dispersion relation is in fact the global 
 extremum.  Based on joint work with Y.Canzani\, G.Cox\, P.Kuchment and J.M
 arzuola.\n\nAdd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210505T160000
DTEND;TZID=Asia/Jerusalem:20210505T170000
LAST-MODIFIED:20210325T230020Z
SUMMARY:Special Analysis Seminar: Gregory Berkolaiko (Texas A&M) 'Lateral v
 ariation principle and extrema of dispersion relation of periodic graphs'
URL;TYPE=URI:https://mathematics.huji.ac.il/event/special-analysis-seminar-
 gregory-berkolaiko-texas-am-tba
END:VEVENT
BEGIN:VEVENT
UID:calendar.2616379.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210209T090014Z
DESCRIPTION:Date: \n\n12:00pm  to  1:00pm\n\n\nSee also: Analysis\, Events 
 & Seminars\, Seminars\n\nAdd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210512T120000
DTEND;TZID=Asia/Jerusalem:20210512T130000
LAST-MODIFIED:20210209T090014Z
SUMMARY:Analysis Seminar: Itai Alpern (HUJI)
URL;TYPE=URI:https://mathematics.huji.ac.il/event/analysis-seminar-itai-alp
 ern-huji
END:VEVENT
BEGIN:VEVENT
UID:calendar.2841702.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210320T070009Z
DESCRIPTION:Date: \n\n4:00pm  to  5:00pm\n\n\nSee also: Analysis\, Events &
  Seminars\, Seminars\n\nAdd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210602T160000
DTEND;TZID=Asia/Jerusalem:20210602T170000
LAST-MODIFIED:20210320T070009Z
SUMMARY:Analysis Seminar (note the non-standard time!): Yariv Aizenbud (Yal
 e)
URL;TYPE=URI:https://mathematics.huji.ac.il/event/analysis-seminar-note-non
 -standard-time-yariv-aizenbud-yale
END:VEVENT
BEGIN:VEVENT
UID:calendar.2656265.field_date.0@mathematics.huji.ac.il
DTSTAMP:20210418T141658Z
CREATED:20210216T200010Z
DESCRIPTION:Date: \n\n12:00pm  to  1:00pm\n\n\nSee also: Analysis\, Events 
 & Seminars\, Seminars\n\nAdd to Calendar\nOutlookGoogle
DTSTART;TZID=Asia/Jerusalem:20210609T120000
DTEND;TZID=Asia/Jerusalem:20210609T130000
LAST-MODIFIED:20210216T200010Z
SUMMARY:Analysis Seminar: Maria Giovanna Mora (Pavia)
URL;TYPE=URI:https://mathematics.huji.ac.il/event/analysis-seminar-maria-gi
 ovanna-mora-pavia
END:VEVENT
END:VCALENDAR