Singular Manual: bFactor

| ##### 7.7.5.0. bFactor Procedure from library `dmodapp.lib` (see dmodapp_lib). Usage: bFactor(f); f poly Return: list of ideal and intvec and possibly a string Purpose: tries to compute the roots of a univariate poly f Note: The output list consists of two or three entries: roots of f as an ideal, their multiplicities as intvec, and, if present, a third one being the product of all irreducible factors of degree greater than one, given as string. If f is the zero polynomial or if f has no roots in the ground field, this is encoded as root 0 with multiplicity 0. Display: If printlevel=1, progress debug messages will be printed, if printlevel>=2, all the debug messages will be printed. Example:
    LIB "dmodapp.lib";
    ring r = 0,(x,y),dp;
    bFactor((x^2-1)^2);
    ==> [1]:
    ==>    _[1]=1
    ==>    _[2]=-1
    ==> [2]:
    ==>    2,2
    bFactor((x^2+1)^2);
    ==> [1]:
    ==>    _[1]=0
    ==> [2]:
    ==>    0
    ==> [3]:
    ==>    x4+2x2+1
    bFactor((y^2+1/2)*(y+9)*(y-7));
    ==> [1]:
    ==>    _[1]=7
    ==>    _[2]=-9
    ==> [2]:
    ==>    1,1
    ==> [3]:
    ==>    2y2+1
    bFactor(1);
    ==> [1]:
    ==>    _[1]=0
    ==> [2]:
    ==>    0
    ==> [3]:
    ==>    1
    bFactor(0);
    ==> [1]:
    ==>    _[1]=0
    ==> [2]:
    ==>    0
    ==> [3]:
    ==>    0

User manual for Singular version 4-0-2, 2015, generated by texi2html.