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247 discussions

Internal Conference - Next Monday/Tuesday
by Hoffman, Neil 20 Jul '18

20 Jul '18

Hello everyone, We are going to have an 'internal conference' on Monday and Tuesday next week. It will largely be informal and centered around Layered solid handlebodies. Location: MSCS 421 (the 3D printing room) Times: 1 pm, Monday and Tuesday (note the original plan had a typo) Tentative schedule: Monday: 1 pm - Robert - Layered Solid tori 2 or so - Bus - Layered Solid handlebodies Discussion Tuesday: 1 pm - Neil - Bitwist Manifolds Afterwards discussion -Neil ______________________ 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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Internal conference
by Hoffman, Neil 23 May '18

23 May '18

Hello everyone, As you all know, Bus is stepping down as chair on June 30th. So to celebrate we were thinking of having a mini-conference July 22-23. We were going to focus on layered solid handlebodies, which Bus will be speaking about. Robert and I will be speaking about layered solid tori and bi-twist manifolds. We would also be happy if grad students got involved and volunteered to give a talk or too. For example, it would be cool to have someone do a short presentation on using regina and we might have a working afternoon where we try to program up a layered solid handlebody triangulation generator. Contact me if you are interested in joining us. Best, Neil ______________________ 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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Eric's talk today
by Hoffman, Neil 02 May '18

02 May '18

Hello topologists, Today at 3:30 in MSCS 445, Eric will be presenting in topology seminar as part of his qualifying exam. His title and abstract are below. Title: More infinite families of homology lens spaces of lower bounded complexity Abstract: We replicate a computation of Boyer and Lines [BL90] concerning closed orientable 3-manifolds, exhibiting infinitely many prime integral homology lens spaces, M, such that M is obtained by p/q Dehn surgery along a knot in an integral homology sphere, but M cannot be obtained by such a surgery along any knot in the 3-sphere. We then demonstrate additional families of such spaces. Notes: This is a qualifying exam. ______________________ 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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Sunday
by Hoffman, Neil 28 Apr '18

28 Apr '18

Hello everyone, We have three visitors who are sticking around for a little while after the conference: Maria, Matthias, and Hyam. As Sunday is supposed to be such a nice night, so I figured we go to my favorite part of campus: Lake Carl Blackwell. The plan is to meet up at ski point (see attached link) and grill on the lake. It's probably too cold for swimming, but we can still go for a hike and/or grill. We will bring our kite to fly and a soccer ball to kick around. https://goo.gl/maps/tJEVFmCmFf32 If you would like to come join us, RSVP to me so that I can get enough food, beer, other drinks. Let me know if how many people you might bring, if you want beer (RSVP by Saturday for this), and if you want meat or prefer vegetarian. If you don’t rsvp but still want to come that’s fine, but it would be helpful if you brought your own stuff to grill. Finally, an entrance permit is $5 per car for the lake Carl Blackwell recreation area, so be sure to carpool. Best Neil ______________________ 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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Graduate conference this June
by Hoffman, Neil 23 Apr '18

23 Apr '18

Hello everyone, In addition to our conference this upcoming weekend, there are a number of other conferences this summer. I wanted to forward this conference announcement about a graduate student conference at Temple. If you have any questions please talk to me or Henry. The registration deadline for the gradate student conference is April 28th. Also, if you haven't registered yet for Redbud please do. It will help us with food orders and grant reporting. https://docs.google.com/forms/d/e/1FAIpQLScCjHwTLf3Ygk9NX2q5k6MYiElfl76Od0l… Redbud 2018 Registration<https://docs.google.com/forms/d/e/1FAIpQLScCjHwTLf3Ygk9NX2q5k6MYiElfl76Od0l…> docs.google.com Best, Neil ______________________ 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 ________________________________ ---------- Forwarded message --------- From: Matthew Stover <mstover(a)temple.edu<mailto:mstover@temple.edu>> Date: Mon, Apr 23, 2018 at 9:01 AM Subject: Graduate conference this June To: Matthew Stover <mstover(a)temple.edu<mailto:mstover@temple.edu>> Dear friends, I am delighted to advertise the fourth annual Graduate Student Conference in Algebra, Geometry, and Topology, which will take place at Temple on June 2-3 of this year. We will have four exciting plenary speakers (Daniel Krashen, Jean-François Lafont, Kathryn Mann, and Helen Wong) along with a large number (30-35) talks by graduate students. We have been recommended for sufficient NSF funds to fully fund travel and accommodations for about 100 graduate students from throughout the US. All the details, including registration, can be found on the conference webpage. The current deadline says April 28, but this will likely get extended. https://math.temple.edu/events/conferences/gscagt/ I hope that you can pass on this information to the students in your department, and specifically encourage your students to attend. It should be a great event. Best wishes, Matthew Stover and David Futer -- ______________________ 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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Redbud
by Hoffman, Neil 10 Apr '18

10 Apr '18

Two diligent and inquiring students have asked me about our upcoming redbud conference. It seems like we should advertise it locally: http://math.okstate.edu/conferences/redbud/ If you would, please register for the conference, it will help us figure out our numbers, for food and coffee. https://docs.google.com/forms/d/e/1FAIpQLScCjHwTLf3Ygk9NX2q5k6MYiElfl76Od0l… [https://lh6.googleusercontent.com/w8uYcNdnia89GinJK1JqBnrWBQ9S4GS_aAGI-Ou6e…]<https://docs.google.com/forms/d/e/1FAIpQLScCjHwTLf3Ygk9NX2q5k6MYiElfl76Od0l…> Redbud 2018 Registration<https://docs.google.com/forms/d/e/1FAIpQLScCjHwTLf3Ygk9NX2q5k6MYiElfl76Od0l…> docs.google.com A second email will be going out to the department closer to the date, but it would help with the cat herding if topologists registered now. Also, if you are interested in helping us out that would be fantastic. Please contact me about that. Best, Neil ______________________ 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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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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Andy Speaking today
by Hoffman, Neil 13 Feb '18

13 Feb '18

Hello everyone, Andy is speaking today in seminar. His title and abstract are below: Title: Rewriting Systems and Gilman’s Conjecture Speaker: Andy Eisenberg, Oklahoma State University Date: Feb 13, 2018 Time: 3:30 PM Room: MSCS 509 Abstract: Given a rewriting system, we’d like to be able to identify algebraic properties of the group by looking for conditions to check in the rewriting system. In 1986, Avenhaus, Madlener, and Otto proved sufficient conditions for a rewriting system to generate a plain group (a free product of free and finite groups). Gilman conjectured that those conditions could be weakened, and the question remains open. I’ll discuss joint work with Adam Piggott addressing this conjecture. (This talk will be accessible even without background knowledge of rewriting systems.) ______________________ 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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Henry's talk today
by Hoffman, Neil 30 Jan '18

30 Jan '18

Henry is speaking today in seminar. His title and abstract are below: >From veering triangulations to dynamic pairs Speaker: Henry Segerman, Oklahoma State University Date: Jan 30, 2018 Time: 3:30 PM Room: MSCS 509 Abstract: This is joint work with Saul Schleimer. Agol and Guéritaud show that if we take a closed manifold admitting a pseudo-Anosov flow without perfect fits, drilling the singular orbits of the flow give a cusped manifold that admits a veering triangulation. We prove the converse. Part of our proof goes through the theory of dynamic pairs, due to Lee Mosher. In this talk I will focus on this part of the proof. ______________________ 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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