The degree of the forms defining the returned map is 10 in the case of cubic fourfolds, and 26 in the case of GM fourfolds.
i1 : K = ZZ/10000019; S = PP_K^(2,2); -- Veronese surface; o2 : ProjectiveVariety, surface in PP^5 |
i3 : X = specialCubicFourfold S; -- calculated number of nodes (got 0 nodes) o3 : ProjectiveVariety, cubic fourfold containing a surface of degree 4 and sectional genus 0 |
i4 : time f = unirationalParametrization X; -- used 0.637329 seconds o4 : MultirationalMap (rational map from PP^4 to X) |
i5 : degreeSequence f o5 = {[10]} o5 : List |
i6 : degree(f,Strategy=>"random point") o6 = 2 |
The object unirationalParametrization is a method function.