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What I want to do is pretty straight forward: Entere something like this: HoldForm[Sum[la /. a -> b, {l, 0, N}]] and get something like this Σ lb Generally spoken, holding the sum but evaluating the expression inside the sum. Or a way to just hold one kind of function.

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  • $\begingroup$ always better to give a concrete example of an input (the command you give), and what you want the output to be. This way there is less guessing. $\endgroup$
    – Nasser
    Commented Mar 8, 2023 at 23:16

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Use Inactive[Sum][expr] This shuld do just fine.

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