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Concrete mathematics : a foundation for computer science

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34 SUMS<br />

because the derivative of a sum is the sum of the derivatives of its terms. We<br />

will see many more connections between calculus and discrete <strong>mathematics</strong><br />

in later chapters.<br />

2.4 MULTIPLE SUMS<br />

The terms of a sum might be specified by two or more indices, not<br />

just by one. For example, here’s a double sum of nine terms, governed by two Oh no, a nine-term<br />

indices j and k:<br />

governor.<br />

t<br />

Cljbk = olbl + olb2 + olb3<br />

l

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