Rank-nullity theorem states that the rank and the nullity of a matrix add up to the number of columns of a matrix. In the following example, the matrix defined over R has 5 columns but its rank and nullity add up to 4. Is this a bug?
sage: m = matrix(RR,[[1,-1,2,0,3],[2,-1,3,-1,2],[3,0,3,0,6],[6,0,6,-1,9]]) sage: m.nullity() 1 sage: m.ncols() 5 sage: m.rank() 3 -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/groups/opt_out.
