BEGIN:VCALENDAR VERSION:2.0 PRODID:-//University of Utah Math Department//Departmental Colloquium//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Departmental Colloquium - Spring 2000 X-WR-CALDESC:Departmental Colloquium at University of Utah Mathematics Department X-WR-TIMEZONE:America/Denver BEGIN:VEVENT UID:20000210T160000-duane-nykamp@math.utah.edu DTSTART;TZID=America/Denver:20000210T160000 DTEND;TZID=America/Denver:20000210T170000 DTSTAMP:20260821T120902Z SUMMARY:A population density approach that facilitates large-scale modeling of neural networks DESCRIPTION:Speaker: Duane Nykamp\, Courant Insitute\n\nThe neural networks of even small functional units in the brain are enormously complex. Conventional simulation methods, where one models thousands of individual neurons, can take large amounts of computer time even for models of small cortical areas. The population density approach can be used to … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000211T160000-brendan-hassett@math.utah.edu DTSTART;TZID=America/Denver:20000211T160000 DTEND;TZID=America/Denver:20000211T170000 DTSTAMP:20260821T120902Z SUMMARY:The locus of rational cubic hypersurfaces DESCRIPTION:Speaker: Brendan Hassett\, University of Chicago\n\nLet X be a smooth cubic hypersurface of dimension d in complex projective space. By definition, X is rational if its field of algebraic functions is purely transcendental over the complex numbers. Classically, it was known that X is irrational when d=1 and rational when d=2. Clemens and Griffiths … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000211T160000-igor-pak@math.utah.edu DTSTART;TZID=America/Denver:20000211T160000 DTEND;TZID=America/Denver:20000211T170000 DTSTAMP:20260821T120902Z SUMMARY:Combinatorics, probability and computation on finite groups DESCRIPTION:Speaker: Igor Pak\, Yale\n\nI will give a somewhat biased review of recent results on theoretical and practical methods for generating random group elements. Basically we will start by introducing the algorithms and discuss problems from various fields as they arise. No previous knowledge of the subject is assumed. LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000216T160000-angela-stevens@math.utah.edu DTSTART;TZID=America/Denver:20000216T160000 DTEND;TZID=America/Denver:20000216T170000 DTSTAMP:20260821T120902Z SUMMARY:Stochastic interacting particle systems as models for selforganization in microbiology DESCRIPTION:Speaker: Angela Stevens\, Leipzig)\n\nSelforganization in microbiology is not only interesting in itself but also serves as a model problem for questions in morphogenesis, e.g."how do cells manage to cooperate and build higher organized structures." Aggregation or selforganization of a species frequently involves movement towards or … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000217T160000-stephan-luckhaus@math.utah.edu DTSTART;TZID=America/Denver:20000217T160000 DTEND;TZID=America/Denver:20000217T170000 DTSTAMP:20260821T120902Z SUMMARY:Phase changes, evolution of varifolds and the second law of thermodynamics DESCRIPTION:Speaker: Stephan Luckhaus\, Leipzig)\n\nIn continuum physics phase transitions are modelled by a change in the constitutive laws coupling the thermodynamic quantities. In systems with heat and mass diffusion this law may be taken to be the entropy as a function of energy and mass density (for isothermic systems entropy is replaced by free … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000218T160000-cristian-d.-popescu@math.utah.edu DTSTART;TZID=America/Denver:20000218T160000 DTEND;TZID=America/Denver:20000218T170000 DTSTAMP:20260821T120902Z SUMMARY:Stark-type conjectures "over Z" DESCRIPTION:Speaker: Cristian D. Popescu\, University of Texas. Austin\n\nIn the 1970s and 1980s Stark developed a remarkable conjecture aimed at interpreting the first non-vanishing derivative of an Artin L -function $L_{K/k, S}(s,\chi)$ at s=0 in terms of the arithmetic properties of the Galois extension of global fields K/k. Work of Stark, Tate, and Chinburg has … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000222T160000-anette-hosoi@math.utah.edu DTSTART;TZID=America/Denver:20000222T160000 DTEND;TZID=America/Denver:20000222T170000 DTSTAMP:20260821T120902Z SUMMARY:Wine tears and other instabilities in climbing films DESCRIPTION:Speaker: Anette Hosoi\, MIT\n\nWe consider the flow in a thin film generated by partially submerging a rigid plate into a reservoir of ethanol- or methanol-water solutions and wetting its surface. Evaporation leads to concentration and surface tension gradients that drive flow up the plate. An experimental study indicates that … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000224T160000-david-vogan@math.utah.edu DTSTART;TZID=America/Denver:20000224T160000 DTEND;TZID=America/Denver:20000224T170000 DTSTAMP:20260821T120902Z SUMMARY:Three-dimensional subgroups and unitary representations DESCRIPTION:Speaker: David Vogan\, MIT\n\nThe simplest noncommutative compact Lie group is SU(2), the group of unit quaternions. If G* is any compact Lie group, a natural problem is to understand the set D(G*) of conjugacy classes of homomorphisms of SU(2) into G*. Dynkin showed in the 1950s that D(G*) is a finite set, and calculated it in … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000229T160000-clifford-j.-nolan@math.utah.edu DTSTART;TZID=America/Denver:20000229T160000 DTEND;TZID=America/Denver:20000229T170000 DTSTAMP:20260821T120902Z SUMMARY:High-frequency imaging of the earth DESCRIPTION:Speaker: Clifford J. Nolan\, University of Washington\n\nIntensive research is currently taking place in the geophysics community to model wave propagation in anisotropic models of the earth's subsurface. We investigate the associated inverse problem of estimating elastic and electrical properties of the earth from measurements of scattered elastic and … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000302T160000-leonid-ryzhik@math.utah.edu DTSTART;TZID=America/Denver:20000302T160000 DTEND;TZID=America/Denver:20000302T170000 DTSTAMP:20260821T120902Z SUMMARY:Advection enhanced reaction-diffusion DESCRIPTION:Speaker: Leonid Ryzhik\, Universty of Chicago\n\nThe enhancement effect of wind or fluid motion on the rate of chemical reactions, and front propagation in general, is a well known phenomenon, that occurs in many applications ranging from combustion to biology. We will review some previous mathematical results regarding front propagation in the … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000309T160000-alex-mogilner@math.utah.edu DTSTART;TZID=America/Denver:20000309T160000 DTEND;TZID=America/Denver:20000309T170000 DTSTAMP:20260821T120902Z SUMMARY:Is this sperm crawling, or is it just my sick imagination: mathematical model of motility of the crawling sperm cells DESCRIPTION:Speaker: Alex Mogilner\, Davis)\n\nMotility of animal cells is fundamentally important and is the most striking process underlying the phenomena of wound healing, morphogenesis and cancerogenesis. Despite recent radical advances in cell biology and the biophysics of the motile cell, we still do not have a complete picture of how … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000330T160000-peter-e.-trapa@math.utah.edu DTSTART;TZID=America/Denver:20000330T160000 DTEND;TZID=America/Denver:20000330T170000 DTSTAMP:20260821T120902Z SUMMARY:Current directions in the representation theory of real Lie groups DESCRIPTION:Speaker: Peter E. Trapa\, Princeton)\n\nSuppose G is a real Lie group. A classical and still open problem is to describe all continuous, irreducible, length-preserving actions of G on a Hilbert space. An impressive array of ideas has been applied to this problem with varying degrees of partial success. In many cases, these ideas have … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000410T160000-angelo-vistoli@math.utah.edu DTSTART;TZID=America/Denver:20000410T160000 DTEND;TZID=America/Denver:20000410T170000 DTSTAMP:20260821T120902Z SUMMARY:Decomposing equivariant K-theory rings DESCRIPTION:Speaker: Angelo Vistoli\, Bologna, Italy)\n\nVector bundles are among the basic objects of study in all of geometry. Out of vector bundles on an algebraic variety or a topological space X one forms a ring K_0(X), the K -theory ring of X, introduced by Grothendieck. If furthermore there is a group G operating on X one forms the equivariant K … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000418T160000-paul-bresloff@math.utah.edu DTSTART;TZID=America/Denver:20000418T160000 DTEND;TZID=America/Denver:20000418T170000 DTSTAMP:20260821T120902Z SUMMARY:Geometric hallucinations, Euclidean symmetry and pattern formation in primary visual cortex DESCRIPTION:Speaker: Paul Bresloff\, Loughborough University\n\nWe show that the circuitry of the primary visual cortex has approximate Euclidean symmetry with a novel group action. This action gives rise to the spontaneous formation of cortical patterns that generate images in the visual field (via a conformal mapping) consistent with some of the common forms … LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT BEGIN:VEVENT UID:20000504T160000-john-warnock@math.utah.edu DTSTART;TZID=America/Denver:20000504T160000 DTEND;TZID=America/Denver:20000504T170000 DTSTAMP:20260821T120902Z SUMMARY:How a simple and elegant piece of mathematics completely changed the world of printing and publishing DESCRIPTION:Speaker: John Warnock\, Adobe Systems\n\nArchival event entry migrated from the legacy colloquium website. LOCATION:JWB 335 URL:http://math.utah.edu/research/colloquia/test/2000-spring/ END:VEVENT END:VCALENDAR