### A Lagrangian fibration

See, for instance, pages 6 and 12 of my article, where this arises in the context of representation theory of SL(2, R).

Announcement:The 2019 Union College Math ConferenceFriday Sept 13 – Sunday Sept 15.I am co-organizing the session onDifferential Geometry, Geometric Analysis, and Mathematical Physicswith my colleagues Charles Boyer, Jeff Jauregui, and Christina Tønnesen-Friedman. There will also be parallel sessions in:Applied Topology;History of Mathematics;andNumber Theory.Plenary speakers:Robert Ghrist(University of Pennsylvania)Carolyn Gordon(Dartmouth College)Álvaro Lozano-Robledo(University of Connecticut)John McCleary(Vassar College)The website for the conference can be found here.

#### Ehssan Khanmohammadi

#### Visiting Assistant Professor of Mathematics

Department of Mathematics

Union College

Schenectady, NY 12308

**Office: **108B Bailey Hall

**Email: **khanmohe@union.edu