Mdtop March 2018

mdtop@mathdept.okstate.edu

1 participants
2 discussions

Topology seminar today
by Hoffman, Neil 28 Mar '18

28 Mar '18

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

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Wednesday in topology seminar
by Hoffman, Neil 13 Mar '18

13 Mar '18

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

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Mdtop March 2018