Singular Manual: univariate

  | ### 5.1.160 univariate `Syntax:` `univariate (` poly_expression `)` `Type:` int `Purpose:` returns 0 for not univariate, -1 for a constant or the number of the variable of the univariate polynomial. `Example:`
        ring r=0,(x,y,z),dp;
        univariate(x2+1);
      ==> 1
        univariate(x2+y+1);
      ==> 0
        univariate(1);
      ==> -1
        univariate(var(2));
      ==> 2
        var(univariate(z));
      ==> z
See leadexp; var.

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