Hello everyone,
Robert is giving a topology seminar today. Note (especially for me) MSCS 445 is the correct room.
Primer on realizability
Speaker: Robert Haraway, Oklahoma State University
Date: Mar 28, 2018
Time: 3:30 PM
Room: MSCS 445
Abstract: This is a working seminar on geometric realizability of group presentations. We review the standard data structures and algorithms for strong realizability and geometric realizability due to John Berge. If time permits we will conclude with speculation about how to augment these algorithms to produce completely ideal triangulations.
______________________
Neil R. Hoffman
Assistant Professor
Department of Mathematics
523 Math Science Building
Oklahoma State University
Stillwater, OK 74078-1058
405-744-7791
http://math.okstate.edu/people/nhoffman
Hello everyone,
There was a faculty meeting today so Charlie Cunningham's topology seminar will be held Wednesday in MSCS 422 at 3:30. Talk to Andy if you are interested in going out to lunch with the speaker. We will also take Charlie out for dinner at hideaway at 5:30.
Best,
Neil
Title: The Geometry of Outer Automorphism Groups of Universal Right-angled Coxeter Groups
Speaker: Charles Cunningham, Haverford College
Date: Mar 14, 2018
Time: 3:30 PM
Room: MSCS422
Abstract: We investigate the combinatorial and geometric properties of automorphism groups of universal right-angled Coxeter groups. McCullough-Miller space is a polyhedral complex which is virtually a geometric model for the outer automorphism group of a universal right-angled Coxeter group, Out(Wn). As it is currently an open question as to whether or not Out(Wn) is CAT(0) or not, it would be helpful to know whether McCullough-Miller space can always be equipped with an Out(Wn)-equivariant CAT(0) metric. We show that the answer is in the negative. This is particularly interesting as there are very few non-trivial examples of proving that a space of independent interest is not CAT(0).
Note the special date and time.
______________________
Neil R. Hoffman
Assistant Professor
Department of Mathematics
523 Math Science Building
Oklahoma State University
Stillwater, OK 74078-1058
405-744-7791
http://math.okstate.edu/people/nhoffman
