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Mathematica 8 does not like Sum[1/k,{k,n,10}]

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  • Subject: [mg130767] Mathematica 8 does not like Sum[1/k,{k,n,10}]
  • From: valvola <g.resta at iit.cnr.it>
  • Date: Sun, 12 May 2013 03:29:16 -0400 (EDT)
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Apparently, Mathematica 8 does not like the simple expression:

Clear[k,n]; Sum[1/k,{k,n,8}] 

The result is two errors:
Power::infy: "Infinite expression 1/0 encountered."

and a large expression
DifferenceRoot[
 Function[{\[FormalY], \[FormalN]}, {\[FormalN] \
\[FormalY][\[FormalN]] + .... etc.etc. 

By the way, the similar Sum[1/k, {k, 8, n}] works fine.

????
g.



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