Hello everyone,

I hope you had a great weekend. Tomorrow (Tuesday) will mark the first topology seminar of the semester and the first in person seminar in a while. Having said that, there is the possibility of a virtual option, if you need that. Contact me and we can try to set that up.

Our speaker is our own Jonathan Johnson we will be in MSCS 445 (on the 4th floor).

Time: 3:30 central Date: Tuesday, September 6th.

Title: Non-standard bi-orders on punctured torus bundles Abstract: Consider a once punctured surface bundle over the circle. Perron-Rolfsen shows that having an Alexander polynomial with real positive roots is a sufficient condition for the bundle to have bi-orderable fundamental group. This is done by showing the action of the monodromy induced on the fundamental group of the surface preserves a “standard” bi-ordering. In this talk, we discuss if there are other ways to bi-order the fundamental group of a punctured torus bundle. This work is joint with Henry Segerman.

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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