If pi is a permutation, e.g. defined by pi=permutations(4)[3], then pi.signature() returns what I have always called the "sign" of pi, and none of pi.sign(), pi.sgn(), sign(pi), sgn(pi) work.
Is there a good reason for not having, at least, the alias pi.sign = pi.signature? I cannot remember often having heard people talk of a permutations's signature (let alone its parity, pace wikipedia) but I am prepared to be over-ruled by an expert in combinatorics. However I still think that the abbreviation "sign" would be reasonable to have too. Perhaps number-theorists are just lazy: sage: a = QuadraticField(101).gen() sage: a.minimal_polynomial() # fails sage: a.minimum_polynomial() # fails sage: a.minpoly() x^2 - 101 John -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To post to this group, send email to sage-devel@googlegroups.com. To unsubscribe from this group, send email to sage-devel+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel?hl=en.
