Week of September 6-10, 2010 Monday, September 6, 2010 Labor Day - Holiday Tuesday, September 7, 2010 10:45 AM Math 1220 Instructor Meeting 400 MSC 4:00 PM Math 1280/1300 Meeting 400 MSC Wednesday, September 8, 2010 9:00 AM Math 1150 Instructor Meeting 400 MSC 11:30 AM Statistics Seminar 459 MSC Zheng Zeng, Dept of Economics, BGSU In this talk, we estimate a five-state common factor model and identify the indexes of credit conditions, aggregate uncertainty, monetary policy, inflation and real economic activity. By examining the interactions between credit and aggregate uncertainty, we find that credit spreads, especially the riskier bond spreads, which are the most popular measures of credit frictions, do carry nontrivial amount of information in second moment uncertainty besides revealing credit market conditions. Because of the flight to quality effect caused by the aggregate uncertainty, the credit spreads tend to overstate the sizes of credit market frictions. Also, a shock to aggregate uncertainty is an important source of the fluctuations in real economic activity. 1:30 PM Analysis Seminar 459 MSC Kate Overmoyer Non-synthetic diagonal operators on the space of functions analytic on the disk A diagonal operator acting on the space H(D) of functions analytic on the unit disk is any continuous linear map having the monomials z^n as eigenvectors and distinct eigenvalues. An operator admits spectral synthesis if every closed invariant subspace of the operator is the closed linear span of some collection of its eigenvectors. In this talk, we find a class of diagonal operators which fail to admit synthesis on H(D). In particular, we show that the diagonal operator with eigenvalues n^(1/p) placed symmetrically on finitely many rays fails synthesis on H(D). 2:30 PM Calculator Workshop 459 MSC Cheryl Grant Graphing Functions 3:30 PM Algebra Seminar 445 MSC Rieuwert Blok, BGSU 1-Cohomology of simplicial complexes of groups 3:40 PM Calculus Seminar 447 MSC 1) A discussion of two articles from the MAA website; "What is conceptual understanding?" by Keith Devlin, and Launching's "Restore the Integral to the Fundamental Theorem of Calculus" by David Bressoud. 2) Mary Koshar will present some reading assignments for calculus I and II students. Thursday, September 9, 2010 10:45 AM Math 1120 Instructor Meeting 400 MSC 3:45 PM Foundational Math Committee 400 MSC Friday, September 10, 2010 3:30 PM COLLOQUIUM 459 MSC Rieuwert Blok, BGSU Amalgams of Groups The motivation for the study of amalgams is that it provides a means for knowing an often fantastically complicated group (the universal completion of the amalgam) by local data, that is, by a relatively small collection of small subgroups called an amalgam. The rank-2 amalgams for groups of Lie type resulting from Phan's theorem and the Curtis-Tits theorem, are used in the Gorenstein-Lyons-Solomon revision of what might well be called the most momentous theorem in group theory, the classification of finite simple groups. An attractive aspect of the theory of amalgams is that it employs the interplay between groups and geometric structures. As such, it belongs in the modern area of geometric group theory. I will give a concise introduction to the topic, add some historical perspective, and then focus on some interesting questions and current developments.
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