The following example sage: p = 17 sage: F = GF(p) sage: P2.<X,Y,Z> = ProjectiveSpace(F,2) sage: C = Curve(X^2+Y^2-Z^2) sage: len(C.rational_points()) 18 sage: C.rational_points(algorithm='bn') --------------------------------------------------------------------------- RuntimeError Traceback (most recent call last) ... RuntimeError: Singular error: Computing affine singular points ... Computing all points at infinity ... Computing affine singular places ... Computing singular places at infinity ... Computing non-singular places at infinity ... The given polynomial is a unit in the power series ring! // ** right side is not a datum, assignment ignored ? `_` is undefined ? error occurred in brnoeth.lib::place line 1155: ` return(HND); ` ? leaving brnoeth.lib::place skipping text from `;` error at token `)` ? leaving brnoeth.lib::Adj_div
** Unable to use the Brill-Noether Singular package to compute all points (see above). suggests to me that there is a bug in Singular's code to enumerate the rational points on a (very simple) curve. If it's not a bug then we need to find out what the restrictions are on the singular function being called, and catch this. Has anyone seen this before? John -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
