Clearly Robert has found a bug in maxima. Here's a little test further to 
my earlier "puzzle":
If I write in sage as follows:

var('r12 r13 r23',domain='complex')
assume(r12>0, r13>0, r23>0)

#trace( "bool(-(r13^2*r23-r23^3)/((-r23^4)+2*r13^2*r23^2-r13^4+r12^4) == 
0)" )
bool(-(r13^2*r23-r23^3)/((-r23^4)+2*r13^2*r23^2-r13^4+r12^4) == 0)

then sage finishes without error! Instead, it returns "False".
Dropping into pydb, I recover the identical *statement* being shipped off 
to Maxima!
    450                     line = line[ind_semi+1:]
    451                 if statement:
5-> 452                     result = ((result + '\n') if result else '') + 
    453             else:
    454                 statement = line[:ind_dollar]

ipdb> p statement

This behavior is independent of whether the variables are declared 'real' 
or 'complex'. 
Conclusion: something else is going on in manifolds and/or in maxima. 

Robert, what version of maxima did you test?
 - Richard

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 post to this group, send email to
Visit this group at
For more options, visit

Reply via email to