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error with Sum and Infinity

• To: mathgroup at smc.vnet.net
• Subject: [mg102245] error with Sum and Infinity
• From: Llewlyn <tommaso.biancalani at gmail.com>
• Date: Sun, 2 Aug 2009 06:01:39 -0400 (EDT)

Hi experts,

i'm very new to Mathematica and this is my first problem. I define a
function that is 0 everywhere:
t[i_] := 0
expect for point i =3 that is:
 t[3] = 1
If now i evaluate the finite sum i obtain 1 as expected
Sum[ t[i], {i, 1, 10}]
Out = 1
but if i try do the same with infinity i obtain
In[808]:= Sum[ t[i], {i, 1, Infinity}]
Out[808]= 0
instead of 1 expected. Any advice?

tb

• Follow-Ups:
  • Re: error with Sum and Infinity
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
  • Re: error with Sum and Infinity
    • From: Tomas Garza <tgarza10@msn.com>