I have used SageMath within CoCalc for teaching Calculus 2 for several
years.
In past semesters, the following code produced the output "ind":
var('n')
sum(n*(-1)^n,n,1,oo)
This is expected, since the series diverges.
However, this semester I changed the kernel from SageMath 10.4 to the
current SageMath 10.7. Now this same code produces the output "-1/4" [I
believe 10.5 and 10.6 behave the same way as 10.7.]
I have my students compute the value of several similar series (replacing
the -1 in the code above with -2, -1/2, 1/2, 1, and 2), and all the others
are behaving the same way they always have. It is only this series which is
giving me an unexpected output.
Has anyone else encountered this issue?
Thanks,
Aaron
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