⋃ -- union of multi-projective varieties

Synopsis

• Usage:

  ⋃ {X,Y,Z,...}

• Inputs:
  • a list {X,Y,Z,...} of multi-projective varieties
• Outputs:
  • a multi-projective variety, the union $X\cup Y \cup Z\cup \cdots$

Description

i1 : K = ZZ/33331;

i2 : L = for i to 9 list point PP_K^({1,2,2},{1,1,3});

i3 : ⋃ L

o3 = 0-dimensional subvariety of PP^1 x PP^2 x PP^9 cut out by 94 hypersurfaces of multi-degrees (0,0,2)^45 (0,1,1)^20 (0,4,0)^5 (1,0,1)^10 (1,2,0)^2 (1,3,0)^4 (2,2,0)^4 (3,1,0)^2 (4,1,0)^1 (10,0,0)^1 

o3 : ProjectiveVariety, 0-dimensional subvariety of PP^1 x PP^2 x PP^9

i4 : degree oo

o4 = 10

See also

• MultiprojectiveVariety + MultiprojectiveVariety -- union of two multi-projective varieties