I confirm the bug with Sage 10.3.beta7. It seems to be linked with the Maxima interface. Meanwhile, a workaround is to use the SymPy interface:
sage: sum((4*n+1)/factorial(n), n, 1, oo, algorithm='sympy') 5*e - 1 Eric. Le vendredi 9 février 2024 à 11:57:08 UTC+1, Georgi Guninski a écrit : > hi, > > var('n') > sum((4*n+1)/factorial(n),n,1,oo) > > TypeError: 'NoneType' object is not callable > -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/824cbae6-d30d-4d27-8e08-38f787978bc4n%40googlegroups.com.