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Concrete mathematics : a foundation for computer science

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498 ANSWERS TO EXERCISES<br />

3.40 Let L2J;;I = 4k + r where -2 < r < 2, and let m = LJ;;]. Then the<br />

following relationships can be proved by induction:<br />

segment r m X Y<br />

wk -2 2k-1 m(m+l)-n-k k<br />

Sk -1 2k-1 -k m(m+l)-n+k<br />

Ek 0 2k n-m(m+l)+k --k<br />

Nk 1 2k k n-m(m+l)-k<br />

if and only if<br />

(2kk1)(2k-1)

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