BGU Math30th European Workshop on Computational Geometry (EuroCG 2014)March 3-5, 2014, Ein Gedi2016-03-21T12:03:49+02:002015-06-05T14:46:29+03:00BGU MathA night of mathematics and JazzNovember 26, 18:00-22:00, 2017, Math -1012017-11-25T18:11:12+02:002017-11-24T17:03:54+02:00BGU Math<p><strong>All faculty and students are cordially invited.</strong></p>
<h4 id="program">Program</h4>
<h5 id="undergraduate-math-club">18:00 Undergraduate math club</h5>
<p><em>Barak Weiss</em>, Tel Aviv University</p>
<p><strong>The illumination problem</strong></p>
<p>The following elementary problem in geometry is still open: given a polygon <script type="math/tex">P</script> in the plane, say that points <script type="math/tex">x</script> and <script type="math/tex">y</script> in <script type="math/tex">P</script> <em>see each other</em> if there is a billiard path from <script type="math/tex">x</script> to <script type="math/tex">y</script>. Is there a polygon in which infinitely many pairs of points do not see each other?</p>
<p>Such problems turn out to be easy to state but very difficult to solve. I will explain this and related questions in greater detail, and describe some recent progress which relies on well-known work of Eskin and Mirzakhani (part of the late Maryam Mirzakhani’s Field medal citation).</p>
<h5 id="a-jazz-show-by-tsachik-and-the-perverse-sheaves">19:00 A <strong>Jazz show</strong> by <em>Tsachik and the perverse sheaves</em></h5>
<p><a href="http://www.ehudettun.com/">Ehud Ettun</a> on bass</p>
<p><a href="https://harukayabuno.com/en">Haruka Yabuno</a> on Piano</p>
<p><em>Tsachik Gelander</em> on drums</p>
Action NOWMarch 24, 2015, BGU2016-03-24T08:18:22+02:002015-06-05T14:46:29+03:00BGU MathAction Now Seminar: Mostow and RigidityMay 7, 2013, Ben-Gurion University Math dept. building2016-03-21T12:05:38+02:002015-06-05T14:46:29+03:00BGU MathAlgebra & number theory dayJune 23, 11:30-16:30, 2016, Seminar room -101, Math building (58), BGU2016-06-12T17:40:46+03:002016-06-03T17:29:43+03:00BGU Math<h3 id="speakers">Speakers</h3>
<ul>
<li><strong>Christian MAIRE</strong> – University of Franche-Comté (France)</li>
<li><strong>Eliyahu MATZRI</strong> – Bar-Ilan University (Israel)</li>
<li><strong>Thomas WEIGEL</strong> – University of Milano-Bicocca (Italy)</li>
</ul>
<h3 id="program">Program</h3>
<dl>
<dt>11:30 -11:40</dt>
<dd>
<p>Opening with Prof. M. Cohen</p>
</dd>
<dt>11:40 -12:40</dt>
<dd>
<p>C. Maire - Infinite extensions of number fields, analytic pro-p groups and fixed points</p>
</dd>
<dt>12:45 -13:45</dt>
<dd>
<p>Lunch - offered to all participants</p>
</dd>
<dt>14:00 -15:00</dt>
<dd>
<p>E. Matzri - One sided genus of a central simple algebra</p>
</dd>
<dt>15:00 -15:30</dt>
<dd>
<p>Coffee break</p>
</dd>
<dt>15:30 -16:30</dt>
<dd>
<p>T. Weigel - Koszul pro-p groups</p>
</dd>
</dl>
Algebraic Combinatorics dayMarch 29, 2016, Room -101, Math building (58), BGU2016-03-24T08:13:23+02:002016-03-20T18:40:37+02:00BGU Math<p>In honor of Prof. Mikhail Klin, on the occasion of his retirement</p>
Award of the Noriko Sakurai Postdoctoral FellowshipMay 12, 2015, BGU2016-03-24T08:34:58+02:002015-06-04T14:18:24+03:00BGU MathAward of the Noriko Sakurai Postdoctoral FellowshipMay 20, 2014, BGU2016-03-21T12:03:31+02:002015-06-05T14:46:29+03:00BGU MathAward of the Noriko Sakurai Postdoctoral Fellowship for 2013December 25, 2012, BGU2016-03-24T08:18:54+02:002015-06-05T14:46:30+03:00BGU MathAward of the Noriko Sakurai Postdoctoral Fellowship for 2016June 7, 14:00-16:00, 2016, Seminar room -101, Math building (58), BGU2016-05-04T12:43:33+03:002016-05-04T12:43:33+03:00BGU MathCohn's theory of universal skew fields of fractionsFebruary 6, 11:30-February 18, 11:30, 2018, Room -1012018-02-04T17:59:18+02:002018-02-04T17:59:06+02:00BGU Math<p><strong>Jurij Volcic</strong> (BGU) will give three lectures on the theory of universal skew fields of fractions due to P.M. Cohn, a beautiful and powerful tool of noncommutative algebra little known outside of a small circle of cognoscenti. Everybody is invited (the lectures should be accessible for graduate students).</p>
<p>Time and place:</p>
<p><strong>Tuesday Feb. 6, Thursday Feb. 15, and Sunday Feb. 18 at 11:30-13:00 in Room -101</strong></p>
<p><strong>Abstract:</strong></p>
<p>As opposed to the commutative setting, localization in noncommutative rings is a much more intricate topic, accompanied with various subtle obstacles and at first sight counter-intuitive phenomena. An exceptional contribution to this field has been made by Paul Moritz Cohn (1924-2006) with the introduction of universal skew fields of fractions in the 70’s, and his subsequent development of this theory. In the self-contained course of three talks I will try to present some of Cohn’s core results with the view towards the universal skew field of fractions of a free algebra.</p>
<p><strong>In the first lecture</strong> we will consider the general problem of embedding rings into skew fields, and early difficulties accompanying it. Following Cohn we will then introduce the category of epic skew fields and specializations assigned to a fixed ring. This will allow us to talk about universal skew fields of fractions and to draw parallels with the commutative theory.</p>
<p><strong>In the second lecture</strong> we will explain the interplay between specializations, singular kernels, matrix ideals in matrix representation of fractions. Our aim will be to determine necessary and sufficient conditions for a ring to admit a (universal) skew field of fractions.</p>
<p><strong>In the last lecture</strong> we will finally look at a concrete family of rings admitting universal skew fields of fractions: free ideal rings (firs), among which are free algebras, and their generalizations. We will trace down their distinguishing property that fulfills the sufficient condition from the previous lecture.</p>
Complex and Symplectic geometryMay 8, 11:00-16:00, 2018, Math -101, BGU2018-05-03T20:44:15+03:002018-05-03T20:43:56+03:00BGU MathDistinguished Lecture Series: Prof. Ilijas Farah, York University, CanadaMay 7-18, 2015, BGU2016-03-24T08:39:55+02:002015-06-05T14:46:28+03:00BGU MathDynamics on parameter spaces 2013January 27-February 1, 2013, Sde Boker2015-09-26T14:45:28+03:002015-06-05T14:46:30+03:00BGU MathErgodic Theorems and Applications in ProbabilityMay 3-8, 2015, Eilat2015-09-26T15:25:51+03:002015-06-05T14:46:29+03:00BGU MathGauchman scholarship and Noriko Sakurai fellowships awardMay 8, 14:00-16:00, 2018, Math -1012018-05-03T20:41:02+03:002017-12-20T18:17:14+02:00BGU MathGeometric Topology and Geometry of Banach SpacesMay 14-19, 2017, Eilat, Israel2017-11-24T16:20:15+02:002017-11-24T16:20:10+02:00BGU MathInteractions between Logic, Topological structures and Banach spaces theoryMay 19-24, 2013, Eilat2016-03-21T12:04:42+02:002015-06-05T14:46:29+03:00BGU MathMini conference in operator algebrasApril 9-10, 2013, BGU2016-03-21T12:06:11+02:002015-06-05T14:46:30+03:00BGU MathNetworks of Linear Systems and Operator TheoryMarch 19-24, 2017, Sde Boker2017-03-20T08:59:37+02:002017-03-20T08:59:36+02:00BGU MathOperator algebras and operator theoryMay 13, 11:10-15:30, 2015, BGU2015-09-26T14:45:28+03:002015-06-04T13:03:35+03:00BGU Math<p>Joint Operator Algebras and Operator Theory Seminar, bringing together people from Ben-Gurion University, the Technion, Tel Aviv University and the University of Haifa</p>
School - Arithmetic groupsMarch 12, 16:30-March 17, 12:00, 2017, Mitzpe Ramon2016-12-18T21:04:01+02:002016-12-15T16:34:43+02:00BGU Math<p>There will be five main Mini-Courses as follows:</p>
<ol>
<li><strong>Higher rank lattices rigidity and arithmeticity,</strong> Tsachik Gelander (Weizmann).</li>
<li><strong>Exotic lattices,</strong> Pierre-Emmanuel Caprace (U.C. Louvin).</li>
<li><strong>Strong approximation in linear groups,</strong> Nikolay Nikolov (Oxford).</li>
<li><strong>Arithmetic hyperbolic 3-manifolds,</strong> Nicolas Bergeron (Jussieu)</li>
<li><strong>The congruence subgroup property,</strong> Nir Avni (Northwestern).</li>
</ol>
School on Polish GroupsMay 22-27, 2016, Midreshet Sde-Boker2016-03-24T10:50:49+02:002016-03-24T10:50:49+02:00BGU Math<p>The School will focus on Polish Groups. General theory, examples, representations of discrete groups with Polish targets, and applications to discrete groups, geometry and dynamics. The three main courses will be:</p>
<h3 id="mini-courses">Mini-Courses###</h3>
<ol>
<li><strong>General theory of Polish groups</strong> Jullien Melleray, Christian Rosendal and Todor Tsankov.</li>
<li><strong>Algebraic groups over Polish fields.</strong> Jean Lécureux and Bertrand Rémy.</li>
<li><strong>Infinite dimensional Lie groups and their symmetric spaces</strong> Bruno Duchesne.</li>
</ol>
Second Local Model Theory DayDecember 17, 11:00-17:00, 2017, Math -1012017-12-04T17:31:05+02:002017-12-04T17:31:01+02:00BGU MathSet Theory, Model Theory and ApplicationsApril 22-26, 2018, Eilat Campus of Ben-Gurion University of the Negev (Israel)2017-08-04T07:29:09+03:002017-08-04T07:28:29+03:00BGU MathSpecial SeminarJune 16, 10:00-11:00, 2015, Room -101, BGU2016-03-24T11:05:30+02:002015-06-06T22:11:26+03:00BGU Math<p><strong>Speaker</strong>: <em>Antoine Ducros</em> (Paris 6)</p>
<p><strong>Title</strong>: <em>Stability of Gauss valuations</em></p>
<p><strong>Abstract</strong>:</p>
<p>A valued field $(k,|.|)$ is said to be <em>stable</em> (this terminology has no link with model-theoretic stability theory) if every finite extension $L$ of $k$ is defectless, i.e., satisfies the equality $\sum e_vf_v=[L:k]$, where $v$ goes through the set of extensions of $|.|$ to $L$, and where $e_v$ and $f_v$ are the ramification and inertia indexes of $v$. The purpose of my talk is to present a new proof (which is part of current joint reflexions with E. Hrushovski and F. Loeser) of the following classical fact (Grauert, Kuhlmann, Temkin,…) : let $(k,|.|)$ be a stable valued field, and let $(r_1,\dots,r_n)$ be elements of an ordered abelian group $G$ containing $|k^*|$. Let $|.|’$ be the $G$-valued valuation on $k(T_1,\dots,T_n)$ that sends $\sum a_I T^I$ to $\max_I |a_I|\cdot r^I$. Then $(k(T_1,\dots,T_n),|.|’)$ is stable too.</p>
<p>Our general strategy is purely geometric, but the proof is based upon model-theoretic tools coming from model theory (which I will first present; no knowledge of model theory will be assumed). In particular, it uses in a crucial way a geometric object defined in model-theoretic terms that Hrushovski and Loeser attach to a given $k$-variety $X$, which is called its <em>stable completion</em>; the only case we will have to consider is that of a curve, in which the stable completion has a very nice model-theoretic property, namely the definability, which makes it very easy to work with.</p>
Special lectureJanuary 16, 10:00-11:00, 2017, Math building (58), room -101, BGU2017-01-12T13:40:22+02:002017-01-12T13:40:22+02:00BGU Math<p>Speaker: <strong>Anton Khoroshkin</strong> (<em>HSE, Moscow</em>)</p>
<h5 id="little-discs-operad-graph-complexes-and-applications">Little discs operad, graph complexes and applications</h5>
<p>The little cubes operad is one of the key objects of the deformation theory of<br />
the last decades. I will outline its geometric definition, some combinatorial <br />
models and different known results and applications.</p>
<p>The framed little cubes operad is much less studied and I will report on some <br />
recent results of related deformation theory, explain relationships with <br />
Deligne-Mumford compactifications of stable curves of zero genus and use it to<br />
prove some conjectures stated for braid and cacti groups whose representations<br />
appear naturally as tensor products in tensor and coboundary categories <br />
correspondingly.</p>
Special lecture in Geometry and PhysicsNovember 21, 11:00-12:00, 2016, Math building (58), room 201, BGU2016-11-20T11:37:52+02:002016-11-20T11:03:03+02:00BGU Math<h5 id="dynamics-of-spacetime--einsteins-equations-as-a-geometric-flow">Dynamics of Spacetime — Einstein’s equations as a geometric flow.</h5>
<p>Speaker: <em>Dr. David Fajman</em> (<strong>Vienna</strong>)</p>
<p>The interpretation of Einstein’s equations as a geometric flow (the Einstein flow) allows to study the evolution of spacetimes from a dynamical point of view. Two types of initial data are mainly considered: Firstly, asymptotically flat data describing initial states of isolated self-gravitating systems and secondly, data on closed manifolds describing initial states for cosmological spacetimes. Studying the evolution of data under the flow we aim to understand its long-time behavior and the global geometry of its time-development. We are interested in the construction of static solutions (or static up to a time-rescaling) as potential attractors of the flow and their nonlinear stability, completeness and incompleteness properties of spacetimes and singularity formation. We present new methods to construct and study solutions by geometric and analytical tools as well as several results in the directions mentioned above. We consider in particular the case of matter models coupled to the Einstein equations, which turns out to provide several interesting phenomena and new classes of solutions.</p>
Spring School on Group C*-algebrasMarch 17-21, 2013, Sde Boker2016-03-21T12:06:27+02:002015-06-05T14:46:30+03:00BGU MathTRATC2014 - Tropicalization, Realization, and Algebraic-Tropical CorrespondenceSeptember 28-October 3, 2014, Eilat2016-03-21T12:03:07+02:002015-06-05T14:46:29+03:00BGU MathThe Batsheva de Rothschild Seminar on Quasicrystals, Delone sets and Generalizations of LatticesMarch 11, 16:43-March 16, 16:43, 2018, Sea of Galilee, at Ohalo Manor Hotel2018-01-28T16:47:58+02:002018-01-28T16:46:08+02:00BGU MathThe Moshe Flato Lecture Series 2002November 28, 2002, BGU2016-04-12T16:39:48+03:002016-04-12T16:39:48+03:00BGU MathThe Moshe Flato Lecture Series 2004November 25, 2004, BGU2016-04-12T16:38:41+03:002016-04-12T16:38:41+03:00BGU MathThe Moshe Flato Lecture Series 2007March 20, 2007, BGU2016-04-12T16:37:36+03:002016-04-12T16:37:22+03:00BGU MathThe Moshe Flato Lecture Series 2008November 27, 2008, BGU2016-04-12T16:27:50+03:002016-04-12T16:27:50+03:00BGU MathThe Moshe Flato Lecture Series 2011March 10, 2011, BGU2016-04-12T16:24:56+03:002016-04-12T16:24:08+03:00BGU MathThe Moshe Flato Lecture Series 2015March 12, 2015, BGU2015-09-26T14:45:28+03:002015-06-05T14:46:29+03:00BGU MathThe Noriko Sakurai fellowship and the Friedman prize for the year 2017May 23, 14:00-16:00, 2017, Deichmann building for Mathematics (58), Seminar room -101, BGU2017-05-08T19:53:26+03:002017-05-08T19:52:33+03:00BGU MathWorkshop on Algebraic, Analytic, and Tropical Geometry (AATG2013)April 28-May 3, 2013, Kibbutz Ein Gedi2016-03-21T12:05:59+02:002015-06-05T14:46:30+03:00BGU MathWorkshop on C*-algebras and Noncommutative DynamicsMarch 11-14, 2013, Sde Boker2016-03-21T12:07:31+02:002015-06-05T14:46:30+03:00BGU MathWorkshop on Generalized CohomologyFebruary 8-12, 2015, Sde Boker2016-03-21T12:02:19+02:002015-06-05T14:46:29+03:00BGU MathWorkshop on the Central Limit TheoremJuly 2, 2013, Ben-Gurion University, math. dept. building2016-03-21T12:04:21+02:002015-06-05T14:46:29+03:00BGU Mathחפירות במדברJuly 13, 2017, אוניברסיטת בן-גוריון, בניין 26, חדר 42017-06-07T15:55:30+03:002017-06-07T15:55:20+03:00BGU Math<p>הנכם מוזמנים לכנס חפירות במתמטיקה השני, אשר יתקיים באוניברסיטת בן-גוריון ביום ה’ ה-13.7.17.</p>
<p>יהיו הרצאות מרתקות במגוון נושאים, תוכלו לפגוש ולהכיר אנשים שמתעניינים במתמטיקה, וכמובן – לחפור!</p>
טקס מלגת הצטיינות על-שם גאוכמןJanuary 3, 14:00-16:00, 2017, בנין 37, חדר 2022016-12-27T13:27:04+02:002016-12-27T13:26:33+02:00BGU Mathערב חשיפה לתארים מתקדמיםApril 12, 17:00-18:30, 2016, חדר סמינרים (101-), בניין 582016-04-09T10:42:46+03:002016-04-09T10:42:46+03:00BGU Math