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- Thread starter jostpuur
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The first is called a series or an infinite sum. The second is called an infinite product.

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HallsofIvy

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[tex]\prod_{k=0}^n \exp(iH_k \Delta t /\hbar)[/tex], where product cannot be turned into sum in the exponent always since [tex]H_k[/tex] do not always commute.

So more generally, the product could be a product of matrices. Of course, if there is some explicit problem, you can see how things go and try to do something tricky, but I just asked this in a hope that there could to be some general results.

The infinite products only weren't precisly what I was after, but the Wolfram site did look interesting anyway.

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