Singular Manual: char_series

  | ### 5.1.6 char_series `Syntax:` `char_series (` ideal_expression `)` `Type:` matrix `Purpose:` the rows of the matrix represent the irreducible characteristic series of the ideal with respect to the current ordering of variables. One application is the decomposition of the zero-set. `Example:`
        ring r=32003,(x,y,z),dp;
        print(char_series(ideal(xyz,xz,y)));
      ==> y,z,
      ==> x,y
See Characteristic sets.

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