Department of

# Mathematics

Seminar Calendar
for events the day of Wednesday, October 14, 2020.

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events for the
events containing

Questions regarding events or the calendar should be directed to Tori Corkery.
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Wednesday, October 14, 2020

1:00 pm in Zoom (email ruiyuan at illinois for info),Wednesday, October 14, 2020

#### A backward ergodic theorem and its forward implications

###### Jenna Zomback (UIUC Math)

Abstract: A pointwise ergodic theorem for the action of a transformation $T$ on a probability space equates the global property of ergodicity of the transformation to its pointwise combinatorics. Our main result is a backward (in the direction of $T^{-1}$) ergodic theorem for countable-to-one probability measure preserving (pmp) transformations $T$. We discuss various examples of such transformations, including the shift map on Markov chains, which yields a new (forward) pointwise ergodic theorem for pmp actions of finitely generated countable groups, as well as one for the (non-pmp) actions of free groups on their boundary. This is joint work with Anush Tserunyan.

3:00 pm in via Zoom (contact atb2@illinois.edu for details),Wednesday, October 14, 2020

#### Intersections of Mathematical and Non-Mathematical Identities

###### Anthony Bonato (Ryerson University)

Abstract: The Teaching & Diversity organizing committee is very excited to have our first speaker joining us virtually next week! Anthony Bonato (Ryerson University) is a prominent advocate for the LGBTQ+ community within math. He is both a chair of and speaker at the "LGBTQ+ Math Day" event that will be held virtually at the Fields Institute in November. He has written numerous articles for news outlets about diversity, inclusion, & equity concerns in math, as well as books and volumes that include "Limitless Minds: Interviews with Mathematician," "Graph Searching Games and Probabilistic Methods," "The Game of Cops and Robbers on Graphs," and "A Course on the Web Graph." Professor Bonato is joining us in the Teaching & Diversity seminar next week specifically so that we can have a dialog with him about the intersections of mathematical and non-mathematical identities. How do these inform each other, and what issues arise when we try to hide or deny their interactions? This is an especially exciting opportunity because he wants to hear from us, collectively, about this issue. We plan to start with an interview-style introduction that will give the audience a sense of how Prof. Bonato's unique experiences and identities inform his mathematical, academic, and extra-curricular practices. Then, we will open the floor for a discussion with the audience, but feel free to just come and listen if you prefer that others ask the questions.