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2 Bulletin of the Polish Academy of Sciences. Mathematics

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A note on differentiability of Lipschitz maps

100%

Górak R.

Bulletin of the Polish Academy of Sciences. Mathematics

2010

tom Vol. 58, no 3

259-268

We show that every Lipschitz map defined on an open subset of the Banach space C(K), where K is a scattered compactum, with values in a Banach space with the Radon-Nikodym property, has a point of Frechet differentiability. This is a strengthening of the result of Lindenstrauss and Preiss who proved that for countable compacta. As a consequence of the above and a result of Arvanitakis we prove that Lipschitz functions on certain function spaces are Gateaux differentiable.

Countable compact scattered T2 spaces and weak forms of AC

44%

Keremedis K. , Felouzis E. , Tachtsis E.

Bulletin of the Polish Academy of Sciences. Mathematics

2006

tom Vol. 54, no 1

75-84

We show that: (1) It is provable in ZF (i.e., Zermelo-Fraenkel set theory minus the Axiom of Choice AC) that every compact scattered T2 topological space is zero-dimensional. (2) If every countable union of countable sets of reals is countable, then a countable compact T2 space is scattered iff it is metrizable. (3) If the real line R can be expressed as a well-ordered union of well-orderable sets, then every countable compact zero-dimensional T2 space is scattered. (4) It is not provable in ZF+¬AC that there exists a countable compact T2 space which is dense-in-itself.