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Question: expand of a Sum

Question:expand of a Sum

RLessard 90 Maple 2018
sum expand
3 hours ago
0

Hi !

When I use the "expand" command on a summation, I've noticed that sometimes the command works and

sometimes it doesn't. I looked through the previous commands to see which one might be causing this problem.

I found that if I use the "changevar" command  from the "student" package,  (deprecated package,I know )

the "expand" command works correctly.     Strange behavior, isn't it ?       I have Maple 2018 on Windows 10.

Regards  !

There is a small  example in the file.

expand-problem.mw
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