<a href="https://www.youtube.com/watch?v=J_snr0eHYjs&feature=youtu.be">Video</a> of the lecture.<br>
<a href="https://www.youtube.com/watch?v=BLFpLj4hMUQ">Waiting room video</a>: interview with Sylvia Serfaty.<br><br>

Defined the Euler integral of an integer valued  weight function w:X --> Z
defined on a planar region X covered by a collection of (closed) regions U<sub>i</sub>. The weight function of main interest is defined by w(x)=|{i : x is in U<sub>i</sub>}|. Explained how a Texas farmer could use the Euler integral to count cows
 on the ranch.  This lecture is based on the recent research article: <a href="http://www.math.upenn.edu/%7Eghrist/preprints/eulerenumerationpart1.pdf">Target enumeration via Euler characteristic integrals</a> by Yuliy Barishnikov (Bell Labs, New Jersey) and
Robert Christ (University of Pennsylvania). Unfortunately, the method could equally well be used to count tanks in a battle field in the ongoing fight against the axis of evil.