OK, that makes sense. Yeah, that would be an important point to mention to students. Thanks.
On Fri, Aug 20, 2010 at 12:43 PM, Mike Hansen <[email protected]> wrote: > On Fri, Aug 20, 2010 at 12:31 PM, michel paul <[email protected]> wrote: > > sage: _ / -3 > > x |--> x > (8/3) > > > > The '>' should be '<'. > > A conscious decision was made for this not to be the case since one > has to check whether or not the operand being applied is less than or > greater than zero. In your specific case, it is easy. However, there > are many times where it is not so clear cut. Consider the case where > you divided by another variable 'a'. Then, should you change the > direction of the inequality or not? Similarly, you could multiply by > something that is zero but not Sage cannot prove that it is zero. > > --Mike > > -- > You received this message because you are subscribed to the Google Groups > "sage-edu" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<sage-edu%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/sage-edu?hl=en. > > -- "Computer science is the new mathematics." -- Dr. Christos Papadimitriou -- You received this message because you are subscribed to the Google Groups "sage-edu" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sage-edu?hl=en.
