Home › Events › Mathematics Colloquium: "Nonnegative sections and sums of squares" Mathematics Colloquium: "Nonnegative sections and sums of squares" Time: Wed, Sep 17 at 4:00 pm – 5:00 pm Location: 231 Hayes-Healy Center Gregory Smith Queen's University Title: Nonnegative sections and sums of squares Abstract Originally published at math.nd.edu.