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MultiprojectiveVarieties :: MultiprojectiveVariety + MultiprojectiveVariety

MultiprojectiveVariety + MultiprojectiveVariety -- union of projective varieties

Synopsis

Description

i1 : R = ZZ/101[x_0,x_1,x_2,y_0,y_1,Degrees=>{3:{1,0},2:{0,1}}];
i2 : X = projectiveVariety ideal random({2,1},R);

o2 : ProjectiveVariety, surface in PP^2 x PP^1
i3 : Y = projectiveVariety ideal random({1,1},R);

o3 : ProjectiveVariety, surface in PP^2 x PP^1
i4 : Z = X + Y;

o4 : ProjectiveVariety, surface in PP^2 x PP^1
i5 : assert(Z - X == Y and Z - Y == X)

See also