Spring 2023 courses:

Math 139, QR, Sections 2 (MoWe 9:30-10:45 Heide 102), 12/P (TuTh12:30-1:45 Heide 112), 15 (TuTh 2:00-3:15 Heide 112), and 20/W (Online);

Math 375-1, Development of Mathematics (MoWe 11-12:15 Heide 219)

My office is Laurentide 2215, my Spring 2023 student office hours are Mondays 12:45 pm-1:45 pm, Tuesdays 11 am-12 noon, Wednesdays 12:45pm-1:45pm, and Thursdays 11am to 12 noon, and by appointment. They may still be via webex. Yes, my office has both Packers and Broncos stuff in it. Here's why. I've also traveled to 5 continents, 16 countries (or maybe 15 or 17 depending on your interpretations of Falkland sovereignty and the Antarctic Treaty), and 38 US states (plus a district and a territory), as well as some land that's not part of any country.

Current research:

Boolean Algebras

Infinite Graph Theory

Set Theory



My Mathematical Genealogy


November 17, 2012. BAs & Hypergraphs

September 20, 2017. Measuring Starlight Deflection during the 2017 Eclipse.

April 6 and 10, 2018, updated version of above at MAA-Wisconsin Section meeting and Video from UW Space Place