Seminar Calendar
for events the week of Tuesday, May 13, 2008.

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Tuesday, May 13, 2008

Orbifolds Seminar
11:00 am   in 347 Altgeld Hall (please note room change!),  Tuesday, May 13, 2008
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Submitted by lerman.
Charles Rezk (UIUC Math)
toposes and stacks III

Geometric Potpourri Seminar
2:00 pm   in 243 Altgeld Hall,  Tuesday, May 13, 2008
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Submitted by j-wetzel.
Prof. Patrick Coulton (EIU Department of Mathematics and Statistics)
Rotund triangular worm covers
Abstract: A triangle ABC labeled so that c £ a £ b is rotund if 45° £ ∠C. Reporting on joint work with Yevgenya Movshovich, we show that a rotund triangle ABC is a worm cover (i.e., it contains a congruent copy of every unit arc) if and only if
b2 ³ 1 + (1/36)(cot ∠A + cot ∠C)2.
To illustrate the geometric arguments involved, we sketch the reasoning in the principal cases: unilateral arcs, z-arcs, w-arcs, s-arcs, etc.