Scattering Amplitudes Program Seminar: Jaroslav Trnka, Caltech By jklein on October 23, 2013 in Quiver Varieties, talks-legacy, videos Jaroslav Trnka, Caltech Title: Four Point Amplitudes from Positivity Speaker: Jaroslav Trnka, Caltech Date: Wednesday, October 23, 2013 Time: 2:00pm – 3:30pm Place: Seminar Room 313, Simons Center [box, type=”download”]Watch the video.[/box]