prevent simplification of sum

• Subject: prevent simplification of sum
• From: Sergey Litvinov
• Date: Wed, 31 Jul 2013 12:10:56 +0200

Is there any way to declare that `A' depends on index `i' and prevent
simplification:

(%i13) 'sum(A, i, 1, N);
(%o13) A*N

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