<p dir="ltr">BINGHAMTON GEOMETRY/TOPOLOGY SEMINAR</p>
<p dir="ltr"> Date: Wednesday, April 22nd, 2015</p>
<p dir="ltr"> Time: 3:30 pm</p>
<p dir="ltr"> Place: Whitney Hall, Room 309. Note the new location of the math department (<a href="http://www2.math.binghamton.edu/p/directions">http://</a><a href="http://www2.math.binghamton.edu/p/directions">www2.</a><a href="http://www2.math.binghamton.edu/p/directions">math.binghamton.edu</a><a href="http://www2.math.binghamton.edu/p/directions">/p/directions</a>).</p>
<p dir="ltr"> Speaker: Ralf Spatzier (University of Michigan) </p>
<p dir="ltr"><font color="#333333"> Title: </font> Higher Rank Rigidity and Positive Curvature </p>
<p dir="ltr"> Abstract: I will review rigidity and non-rigidity results about “higher rank” in Riemannian geometry. Specifically we consider “higher rank” spaces in which subobjects of extremal curvature are plentiful. I will emphasize recent joint work with Schmidt and Shankar on Riemannian manifolds of higher spherical rank where every geodesic c has a perpendicular parallel field making sectional curvature 1 with c, and the sectional curvature is bounded below by 1.</p>
<p dir="ltr">NOTE: The seminar has a webpage where the semester's program is listed:</p>
<p dir="ltr"><a href="http://www2.math.binghamton.edu/p/seminars/topsem">http://www2.math.binghamton.edu/p/seminars/topsem</a></p>