BEGIN:VCALENDAR
PRODID:-//PSU Mathematics Department//Seminar iCalendar Generator//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Department of Mathematics Colloquium
X-WR-TIMEZONE:America/New_York
BEGIN:VTIMEZONE
TZID:America/New_York
X-LIC-LOCATION:America/New_York
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:19700308T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
END:DAYLIGHT
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TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:19701101T020000
RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150115T153000
DTEND;TZID=America/New_York:20150115T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=22018
SUMMARY:Department of Mathematics Colloquium - Homogenization and Anomalous
Diffusion
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Homogeniz
ation and Anomalous Diffusion\nSpeaker: Gautam Iyer\, Carnegie Mellon (Hos
t: Alexei Novikov)\nAbstract: Homogenization is a well known technique use
d to\n approximate the macroscopic behaviour of a material with microsco
pic\n impurities. While this originally arose in the study of composite
\n materials\, it has applications to various other fields\, and I will
\n focus on a few results motivated by fluid dynamics. One well known\n
result in this direction is that of GI Taylor concerning fluid flows\n
in pipes. Unfortunately the length scales involved in typical oil\n pip
elines are not too short this result to apply. I will conclude by\n desc
ribing joint work with A. Novikov concerning cellular flows\n (i.e. stro
ng array of opposing vortices) and a conjecture on the\n effective behav
iour in a regime outside that of standard\n homogenization results.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150122T153000
DTEND;TZID=America/New_York:20150122T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24918
SUMMARY:Department of Mathematics Colloquium - Interpolation problems in al
gebraic geometry
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Interpola
tion problems in algebraic geometry\nSpeaker: Jack Huizenga (Host: Yuxi Zh
eng)\, University of Illinois at Chicago\nAbstract: Classical Lagrangian i
nterpolation states that one can always prescribe n+1 values of a single v
ariable polynomial of degree n. This result paves the way for many beautif
ul generalizations in algebraic geometry. I will discuss a few of these ge
neralizations and their relevance to important questions in mathematics. I
will then discuss recent connections between interpolation problems and t
he birational geometry of Hilbert schemes of points and moduli spaces of v
ector bundles.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150129T153000
DTEND;TZID=America/New_York:20150129T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24919
SUMMARY:Department of Mathematics Colloquium - Faculty Meeting
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Faculty M
eeting\nSpeaker: Faculty Meeting\, Pennsylvania State University
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150205T153000
DTEND;TZID=America/New_York:20150205T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24920
SUMMARY:Department of Mathematics Colloquium - Generation spectra: how comp
lex is a category
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Generatio
n spectra: how complex is a category\nSpeaker: Matthew Ballard (Host: Kirs
ten Eisentraeger)\, University of South Carolina\nAbstract: A basic idea t
o understand a mathematical object better is finding a minimal subset from
which the object can be recovered using the natural operations present. T
hink basis for a vector space as a spectacular example. I will begin by di
scussing this idea and naturally arising problems in the case of finite di
mensional algebras. This will lay the groundwork for a very analogous vers
ion of these questions for triangulated categories. Then I will focus on w
hat these invariants do and could say about varieties\, including how they
compare to familiar invariants and how they may detect irrationality. Fin
ally\, if time allows\, I will shift from algebraic geometry to some other
areas and discuss applications in representation theory\, symplectic topo
logy\, and commutative algebra.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150212T153000
DTEND;TZID=America/New_York:20150212T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24921
SUMMARY:Department of Mathematics Colloquium - See 2:30 - 3:30 talk by Zhen
gcheng Gu
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: See 2:30
- 3:30 talk by Zhengcheng Gu\nSpeaker: See 2:30 - 3:30 talk by Zhengcheng
Gu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150219T153000
DTEND;TZID=America/New_York:20150219T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24922
SUMMARY:Department of Mathematics Colloquium - The equations of the humid a
tmosphere in presence of saturation.
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: The equat
ions of the humid atmosphere in presence of saturation.\nSpeaker: Roger Te
mam\, University of Indiana (Host: Anna Mazzucato)\nAbstract: In this talk
we will describe the equations of the humid atmosphere in presence of sat
uration\, primitive equations\, equations of energy and equation of concen
tration of water vapor. In presence of saturation\, a change of phase can
occur\, and the equations become nonlinear and non-smooth. We show how to
formulate the problem in the context of convex analysis and variational in
equalities\, and derive results of existence\, uniqueness and regularity o
f solutions.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150226T153000
DTEND;TZID=America/New_York:20150226T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24923
SUMMARY:Department of Mathematics Colloquium - Optimal Transportation\, Gra
dient Flows and Stochastic Evolutions
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Optimal T
ransportation\, Gradient Flows and Stochastic Evolutions\nSpeaker: Karl-Th
eodor Sturm (Host: Yuxi Zheng)\, University of Bonn\nAbstract: We present
a brief introduction to recent progress in optimal transportation\nand sto
chastic calculus on manifolds and metric spaces. We recall the characteriz
ation of diffusion equations on Riemannian manifolds M as gradient flows f
or generalized entropy functionals on the space of probability measures P(
M)\, regarded as an infinite dimensional Riemannian manifold. Convexity pr
operties of the relative entropy Ent(.|m) play an important role in a powe
rful concept of generalized Ricci curvature bounds for metric measure spac
es (X\, d\, m). We illustrate new developments on super-Ricci flows for me
tric measure spaces and coupling properties of backward Brownian motions.
\n\nMoreover\, we present fundamental results for the Wasserstein diffusio
n\, a canonical reversible process (µt)t≥0 on the space of probability
measures P(R). This includes: particle approximation\, logarithmic Sobolev
inequaltiy\, quasi-invariance of its invariant measure\, the so-called en
tropic measure\, P\nβ. We also indicate how to construct the entropic mea
sure on multi-dimensional spaces.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150305T153000
DTEND;TZID=America/New_York:20150305T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24924
SUMMARY:Department of Mathematics Colloquium - Techniques and concepts of a
menability of discrete groups
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Technique
s and concepts of amenability of discrete groups\nSpeaker: Kate Juschenko
(Nate Brown)\, Northwestern University\nAbstract: The subject of amenabili
ty essentially begins in 1900's with Lebesgue. \nHe asked whether the prop
erties of his integral are really fundamental \nand follow from more famil
iar integral axioms. This led to the study of \npositive\, finitely addit
ive and translation invariant measure on \ndifferent spaces. In particular
the study of isometry-invariant measure \nled to the Banach-Tarski decomp
osition theorem in 1924. The class of \namenable groups was introduced and
studied by von Neumann in 1929 and \nhe explained why the paradox appear
ed only in dimensions greater or \nequal to three. In 1940's and 1950's a
major contribution was made by M. \nDay in his paper on amenable semigroup
s. We will give an introductory to \namenability talk\, and explain more r
ecent developments in this field.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150312T153000
DTEND;TZID=America/New_York:20150312T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24925
SUMMARY:Department of Mathematics Colloquium - SPRING BREAK
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: SPRING BR
EAK\nSpeaker: SPRING BREAK
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150319T153000
DTEND;TZID=America/New_York:20150319T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24926
SUMMARY:Department of Mathematics Colloquium - Noncommutative triangulation
s and the Laurent phenomenon
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Noncommut
ative triangulations and the Laurent phenomenon\nSpeaker: Vladimir Retakh
(Host: Yuri Zarhin)\, Rutgers University\nAbstract: The celebrated Ptolemy
relation plays an important role in various\nstudies of triangulated surf
aces including hyperbolic geometry\,\ngeometrical applications of cluster
algebras and so on. We will\ndiscuss a noncommutative version of the relat
ion which can\nbe seen as a "categorification" of the classical one.\nThis
leads to new noncommutative invariants of the surfaces and\nprovides seve
ral examples of the noncommutative Laurent phenomenon.\n(Joint work with A
rkady Berenstein from University of Oregon)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150326T153000
DTEND;TZID=America/New_York:20150326T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24927
SUMMARY:Department of Mathematics Colloquium - Fast-slow systems with chaot
ic noise
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Fast-slow
systems with chaotic noise\nSpeaker: David Kelly (Host: John Harlim)\, Co
urant Institute\nAbstract: It has long been observed that multi-scale syst
ems\, particularly those in climatology\, exhibit behavior typical of stoc
hastic models\, most notably in the unpredictability and statistical varia
bility of events. This is often in spite of the fact that the underlying p
hysical model is completely deterministic. \n\nOne possible explanation f
or this stochastic behavior is deterministic chaotic effects. In fact\, it
has been well established that the statistical properties of chaotic syst
ems can be well approximated by stochastic differential equations.\n\nIn t
his talk\, we focus on fast-slow ODEs\, where the fast\, chaotic variables
are fed into the slow variables to yield a diffusion approximation. In pa
rticular we focus on the case where the chaotic noise is multidimensional
and multiplicative. The tools from rough path theory prove useful in this
difficult setting.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150402T153000
DTEND;TZID=America/New_York:20150402T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24928
SUMMARY:Department of Mathematics Colloquium - Algebraic operations in geom
etry\, topology and physics
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Algebraic
operations in geometry\, topology and physics\nSpeaker: Ralph Kaufmann (H
ost: Ping Xu)\, Purdue University\nAbstract: Algebraic structures help in
studying complex problems\, by both organizing the data as well as provid
ing finer invariants.\nParadigmatic examples are groups of invariants\, ri
ng structures on them\, but also generating functions and their properties
\, such as satisfying certain PDEs.\nI will start by giving examples of su
ch structures and then proceed to give a common framework for these algebr
aic structures themselves.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150409T153000
DTEND;TZID=America/New_York:20150409T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24929
SUMMARY:Department of Mathematics Colloquium - Colouring C*-algebras
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Colouring
C*-algebras\nSpeaker: Stuart White\, University of Glasgow (Host: Nate B
rown)\nAbstract: Operator algebras come in two main types: von Neumann\nal
gebras and C*-algebras. These look similar at first sight\, but have\ndist
inct flavours\; C*-algebras are topological objects\, while von\nNeumann a
lgebras have a measurable nature. Nevertheless\, we can now\nsee striking
parallels between the structure of these objects\, with\n`coloured' versio
ns of von Neumann results playing a prominent role in\nC*-algebras. I'll
discuss all this\, assuming no prior knowledge of\noperator algebras.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150416T153000
DTEND;TZID=America/New_York:20150416T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24930
SUMMARY:Department of Mathematics Colloquium - Department Faculty Meeting
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Departmen
t Faculty Meeting\nSpeaker: Department Faculty Meeting\, Penn State
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150423T153000
DTEND;TZID=America/New_York:20150423T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24931
SUMMARY:Department of Mathematics Colloquium - Congruent numbers and L-func
tions
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Congruent
numbers and L-functions\nSpeaker: Professor Shou-Wu Zhang (Host: Winnie
Li)\, Princeton University\nAbstract: A thousand years old problem is to
determine which positive integers are congruent numbers\, i\,e\, which p
ositive integers could be the areas of right angled triangles with sides o
f rational lengths.\nThis problem has some beautiful connections with ell
iptic curves and L-functions. In fact by the Birch and Swinnerton-Dyer co
njecture\, all n= 5\, 6\, 7 mod 8 should be congruent numbers\, and most
of n=1\, 2\, 3 mod 8 should not be congruent numbers.\nIn this lecture\,
I will explain these connections and some recent developments.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150430T153000
DTEND;TZID=America/New_York:20150430T162000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=24932
SUMMARY:Department of Mathematics Colloquium - Quasi-invertibility
DESCRIPTION:Seminar: Department of Mathematics Colloquium\nTitle: Quasi-inv
ertibility\nSpeaker: Ezra Getzler (Host: Ping Xu)\, Northwestern Universit
y\nAbstract: In the theory of differential graded algebras (important in t
he study of moduli problems in geometry\, for example)\, the correct gener
alization of invertibility is invertibility up to a boundary\, or quasi-in
vertibility. In this talk\, we will explain in what sense the quasi-invert
ible elements form a "Lie group". In fact\, they form a generalization of
a group called a higher Lie groupoid.
END:VEVENT
END:VCALENDAR