BOWLING GREEN STATE UNIVERSITY
          DEPARTMENT OF MATHEMATICS AND STATISTICS CALENDAR
 
                         Week of February 24-28

Monday, February 24

 3:15 PM  Coffee
 3:45 PM  COLLOQUIUM  - Room 459 MSC
          Stefan Catoiu, University of Wisconsin, Madison
          "Ideals in tensor powers of the enveloping algebra U(sl_2)"
          Abstract: If K is an arbitrary field of characteristic zero,
            the enveloping algebra U = U(sl_2(K)) is the polynomial
            ring in the noncommuting indeterminates a,b,z subject to
            the relations ab-ba=a, za-az=2a, and zb-bz=-2b.  Using the
            representation theory of sl_2 we can describe all
            two-sided ideals of U.  Precisely, if I is an ideal of U,
            then there exists a single generator f_I for I which s
            unique subject to certain additional conditions.  Thus,
            all the properties of I are encoded in this generator f_I.

            See posters in the department for the continuation of the
            abstract.

Tuesday, February 25

 2:30 PM  STATISTICS SEMINAR  - Room 459 MSC
          P. K. Sen, Distinguished Lukacs Professor, BGSU. 
          "Adaptive rank tests for location"

 3:30 PM  ANALYSIS SEMINAR  - Room 459 MSC
          Gabor Szekely, Dept. of Mathematics and Statistics, BGSU. 
          "Applications of Wiener-Levy's theorem on Fourier transforms
           of L_1 functions"

Wednesday, February 26
      
 3:30 PM  STATISTICS AND PROBABILITY SEMINAR  - Room 300 MSC
          *** Note change in location ***
          Jim Albert, Dept. of Mathematics and Statistics, BGSU. 
          "Hierarchical modeling and Bayes factors - Part II"

 4:30 PM  PHYSICS DEPARTMENT SEMINAR  - Room 106 Overman
          Ken Elder, Oakland University
          "Numerical Investigation of State Selection in Non-Equilibrium
           Systems"
          Abstract: The appearance of lamellar or periodic states in
            driven non-equilibrium systems is an interesting phenomena
            that occurs in many systems such as in Rayleigh Benard
            convection, directional solidification, parametrically
            driven surface waves, electroconvection and directional
            viscous fingering.  Quite often these lamellar states are
            destabilized by secondary instabilities leading toward
            phases that are chaotic or disordered in both space and
            time.  For spatially extended systems this phenomena is
            commonly referred to as spatiotemporal chaos.  In this
            talk I would like to discuss the selection of such states
            in a simple model of directional solidification known as
            the damped Kuramoto Sivashinsky equation.  Extensive
            numerical simulations of this equation are used to explore
            the selection of the non-equilibrium states and to
            describe the period/chaotic transition in both one and two
            dimensions.

 7:30 PM  KME MOVIE
          Copyright restrictions only allow us to call this
          "The movie about computer hackers that might have been named
          Tennis Shoes"
          Contact Kim Nettling, knettli@bgnet

Thursday, February 27

 2:30 PM  SCIENTIFIC COMPUTATION SEMINAR  - Room 459 MSC
          J. Gordon Wade, Dept. of Mathematics and Statistics, BGSU.
          "Computational aspects of total variation minimization"
          Abstract available via WWW at: 
                   http://www-math.bgsu.edu/~gwade/copper97/

 3:30 PM  ALGEBRA SEMINAR  - Room 459 MSC
          Curtis Bennett, Dept. of Mathematics and Statistics, BGSU. 
          "Connected components of the Universal Twin"

Friday, February 28

 3:30 PM  Coffee
 3:45 PM  COLLOQUIUM  - Room 459 MSC
          Michael Anthony Bennett, University of Michigan, Ann Arbor
          "On simultaneous Pell equations and ranks of elliptic curves"
          Abstract: If a is a positive square integer, then the Pell
            equation x^2-az^2=1 has infinitely many solutions in
            positive integers, corresponding to units in the related
            quadratic field.  If, however, a and b are distinct nonzero
            integers, then the analogous situation for the
            simultaneous Diophantine equations x^2 - a z^2 =1 and 
            y^2 - b z^2 = 1 is very different. We discuss these latter
            equations, with particular reference to the Mordell-Weil
            rank of families of certain elliptic curves.

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