Combinatorial formulas for Ottaviani's degree 15 invariant

16,051 formulas for Ottaviani's invariant of cubic threefolds

We provide explicit combinatorial formulas for ottaviani s degree 15invariant which detects cubics in 5 variables that are sums of 7 cubes.Our approach is based on the chromatic properties of certain graphs and relies on computer searches and calculations.Our approach is based on the chromatic properties of certain graphs and relies on computer searches and calculations.Our approach is based on the chromatic properties of certain graphs and relies on computer searches and calculations.