Something I do not understand...
from sympy import Symbol
t=Symbol("t",commutative=True)
A=Symbol("A",commutative=False)
B=Symbol("B",commutative=False)So, now, I do: ee=(t*t/2)*(A+B)*(A+B) ee.expand() gives: t**2*A*B/2 + t**2*A**2/2 + t**2*B*A/2 + t**2*B**2/2 which is what I was waiting for... Now, do: ee=1+t*(A+B)+(t*t/2)*(A+B)*(A+B) I get: 1/2*A^2*t^2 + A*B*t^2 + 1/2*B^2*t^2 + A*t + B*t + 1 Which is not what I was waiting for! It looks like if A*B is considered as B*A in the second case! My Sage version is : 5.9. t.d. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/groups/opt_out.
<<attachment: tdumont.vcf>>
