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Derivatives take every value on the set of approximate continuity points

✍ Scribed by G. Petruska


Publisher
Akadmiai Kiad
Year
1983
Tongue
English
Weight
271 KB
Volume
42
Category
Article
ISSN
1588-2632

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πŸ“œ SIMILAR VOLUMES


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✍ Maxim R. Burke πŸ“‚ Article πŸ“… 2000 πŸ› Elsevier Science 🌐 English βš– 161 KB

We study the class of Tychonoff spaces that can be mapped continuously into R in such a way that the preimage of every nowhere dense set is nowhere dense. We show that every metric space without isolated points is in this class. We also give examples of spaces which have nowhere constant continuous

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✍ Tatsuya Akutsu; MagnΓΊs M. HalldΓ³rsson πŸ“‚ Article πŸ“… 2000 πŸ› Elsevier Science 🌐 English βš– 136 KB

This paper considers the approximability of the largest common subtree and the largest common point-set problems, which have applications in molecular biology. It is shown that the problems cannot be approximated within a factor of n 1-in polynomial time for any ΒΏ0 unless NP βŠ† ZPP, while a general s