Opened 8 years ago

Closed 8 years ago

#718 closed bug (not a bug)

primdecSY (but not primdecGTZ) gives wrong result

Reported by: peterj@… Owned by: somebody
Priority: dontKnow Milestone: 3-1-5 and higher
Component: singular-libs Version: 3-1-5
Keywords: primary decomposition Cc:


ring rr = 0,(a,c,d,e,f,g,b),dp; /* primdecGTZ is MUCH slower if b is in usual position */ LIB "primdec.lib";

ideal fails = 3a2-3a+1, 3b2+3ab-3b-3a+2, 3eg+3a-1, 3cf+3a-1, ef2-d2g, cd2-e2f;

ideal OK = 3a2-3a+1, 3b2+3ab-3b-3a+2, cf-eg, /* the only change */ 3cf+3a-1, ef2-d2g, cd2-e2f;

primdecSY(fails); /* 1 factor ?!*/ primdecGTZ(fails); /* 2 prime factors; is correct. */

/* Using Singular 3-1-5 under Ubuntu 12.04. */ /* Repeated attempts to upgrade have failed */

Change History (1)

comment:1 Changed 8 years ago by hannes

Resolution: not a bug
Status: newclosed

This is a problem of the missing update (4-0-2 works correctly here, may be fixed long ago). To update:

Note: See TracTickets for help on using tickets.