Further Examples: Sum

Here is the sum of the first odd integers.

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Here is another finite sum.

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This makes the iterator increment in steps of .

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Here is a triangular array.

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Here is its sum.

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Mathematica gives an exact result for this sum.

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Wrapping N around this result gives a numerical approximation.

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If you know that you need a numerical result from the start, NSum is faster.

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Symbolic sums

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Infinite series whose sums contain

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Other infinite series

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