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On the complexity of finding a local maximum of functions on discrete planar subsets

✍ Scribed by Anton Mityagin


Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
237 KB
Volume
310
Category
Article
ISSN
0304-3975

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✦ Synopsis


We study how many values of an unknown integer-valued function f one needs to know in order to ΓΏnd a local maximum of f. We consider functions deΓΏned on ΓΏnite subsets of discrete plane. We prove upper bounds for functions deΓΏned on rectangles and present lower bounds for functions deΓΏned on arbitrary domains in terms of the size of the domain and the size of its border.


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## Abstract Let __G__ be a graph on __p__ vertices with __q__ edges and let __r__ = __q__β€‰βˆ’β€‰__p__ = 1. We show that __G__ has at most ${15\over 16} 2^{r}$ cycles. We also show that if __G__ is planar, then __G__ has at most 2^__r__β€‰βˆ’β€‰1^ = __o__(2^__r__β€‰βˆ’β€‰1^) cycles. The planar result is best possib