Large-scale geometry is sometimes described as "geometry when you forgot your glasses": you can't tell what scale something is at or see anything less than a fixed size. In, fact things are so fuzzy that you can't even distinguish the integer lattice from the 2-dimensional plane -- but you can tell these spaces apart from the line.
Quasi-isometries are the large-scale version of distance preserving maps. I'll spend this talk giving examples and applications, and also explain why quasi-isometry is the foundational notion in geometric group theory.

Link: https://cornell.zoom.us/j/94043081671?pwd=T3pZS1l3WEpaTHMySDBEcUxOVEVRQT09

Meeting ID: 940 4308 1671
Passcode: whatis
Contact: nm627 if problems with link