My understanding of Sage is that var('e') declares e as a symbolic variable, no matter that it was the Euler number before. The last line leaves me clueless what goes wrong ...
sage: var('e') e sage: matrix.diagonal([e,1,1]).det() e sage: matrix.diagonal([e,1,1,1]).det() _e -- Peter Mueller -- 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/d/optout.