A Bug in symbolic summation?

*To*: mathgroup at smc.vnet.net*Subject*: [mg113126] A Bug in symbolic summation?*From*: Fancy Airex <aoirex at gmail.com>*Date*: Wed, 13 Oct 2010 23:27:49 -0400 (EDT)

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

**Follow-Ups**:**Re: A Bug in symbolic summation?***From:*Christopher Arthur <aarthur@tx.rr.com>