Hi, I have found the following strange behaviour :
sage: A3=RootSystem(['A',3]).ambient_space() sage: t=A3.simple_root(1)+A3.simple_root(2)-A3.simple_root(3) sage: t.is_positive_root() True It seems that the function is_positive_root() does not check that its input is a root ! I think the actual content of this function should be used in a function called "is_positive". Then there should be a function "is_root" and the actual function "is_positive_root" should check both. What do you think ? Frederic -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-de...@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
