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Concrete mathematics : a foundation for computer science

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“What’s one<br />

and one and one<br />

and one and one<br />

and one and one<br />

and one and one<br />

and one?”<br />

“1 don’t know,”<br />

said Alice.<br />

‘7 lost count.”<br />

“She can’t do<br />

Addition.”<br />

-Lewis Carroll [44]<br />

Additional, eh?<br />

2.3 MANIPULATION OF SUMS 31<br />

And we can now apply the distributive law and evaluate a trivial sum:<br />

2S = (2a+bn) t 1 = (2a+bn)(n+l).<br />

O

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