On 15 November 2016 at 09:12, Bruno Grenet <bruno.gre...@gmail.com> wrote: > Le 15/11/2016 à 08:53, Vincent Delecroix a écrit : >> >> Not currently (though we have "Unknown"). The main problem is the >> interaction with Python booleans and the operators "or", "and", "not" >> (which are *not* logical operators). The Sage "Unknown" is badly >> broken for these reasons >> >> sage: not Unknown # waiting for Unknown >> True >> sage: Unknown or False # waiting for Unknown >> False >> >> So be careful if you start using it! >> >> If we would use the correct logical operators ~ (for negation), ^ (for >> xor) and & (for and) then we might be able to come up with something. >> But Sage sort of ignore them. > > > What do you mean by this? From what I understand, ~, &, ^ are bitwise > operators, while "and", "or", "not" are bit operators. In which sense are > they not logical opeators?
For example they are not commutative sage: 0 and False 0 sage: False and 0 False sage: 1 or 3 1 sage: 3 or 1 3 Vincent -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
