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Re: A Bug in symbolic summation?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg113153] Re: A Bug in symbolic summation?
*From*: Christopher Arthur <aarthur at tx.rr.com>
*Date*: Fri, 15 Oct 2010 13:52:45 -0400 (EDT)
*References*: <201010140327.XAA06188@smc.vnet.net>
Hi Rex,
Hold[] and Simplify[] might help.
Chris.
Fancy Airex a écrit :
> I wish to do a basic symbolic manipulation of two summations.
>
>> Sum[f[i], {i, 0, m}] - Sum[f[i], {i, 0, j}]
>>
>
> but can't get the expected result
>
>> Sum[f[i], {i, j+1, m}]
>>
>
>
> I also tried
>
>> Sum[f[i], {i, 0, m}] - f[0]
>>
>
> but can't get the expected result
>
>> Sum[f[i], {i, 1, m}]
>>
>
>
> Though when I replace m with any definite number everything works
> fine.
>
> It seems that Mathematica can't change the minimum/maximum value of
> the summation variable i above in symbolic calculation...
>
>
> I also tried another system, but failed to do such symbolic computation.
>
> Did I miss any point here?
>
>
> Best,
> Rex
>
>
>
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