Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Piotr Niemiec"'
Autor:
Bartłomiej Błaszczyk, Marcin Straburzyński, Mieszko Więckiewicz, Sławomir Budrewicz, Piotr Niemiec, Martyna Staszkiewicz, Marta Waliszewska-Prosół
Publikováno v:
The Journal of Headache and Pain, Vol 24, Iss 1, Pp 1-21 (2023)
Abstract Background Headache is one of the most common neurological symptoms. Many previous studies have indicated a relationship between primary headaches and alcohol. Drinking has been associated with increased risk of tension-type headache (TTH) a
Externí odkaz:
https://doaj.org/article/4b9ab08e048e46a2a872d690aade60be
Publikováno v:
Molecules, Vol 27, Iss 1, p 187 (2021)
Density functional theory calculations were carried out to investigate the electronic structures of Keggin-typed [XMo12O40]n− and [XW12O40]n− anions with different heteroatoms (X = Zn2+, B3+, Al3+, Ga3+, Si4+, Ge4+, P5+, As5+, and S6+). The influ
Externí odkaz:
https://doaj.org/article/44d16fdd6c8e4a8985975f3065031689
Autor:
Piotr Niemiec
Publikováno v:
Opuscula Mathematica, Vol 31, Iss 3, Pp 425-431 (2011)
The aim of the paper is to show that if \(\mathcal{F}\) is a family of continuous transformations of a nonempty compact Hausdorff space \(\Omega\), then there is no \(\mathcal{F}\)-invariant probabilistic Borel measures on \(\Omega\) iff there are \(
Externí odkaz:
https://doaj.org/article/95d25d59a31a4d7ea49dd12c18404681
Autor:
Piotr Niemiec
Publikováno v:
Opuscula Mathematica, Vol 31, Iss 4, Pp 645-650 (2011)
The aim of the paper is to prove that if \(L\) is a linear subspace of the space \(\mathcal{C}(K)\) of all real-valued continuous functions defined on a nonempty compact Hausdorff space \(K\) such that \(\min(|f|, 1) \in L\) whenever \(f \in L\), the
Externí odkaz:
https://doaj.org/article/dfcd59cc57eb4e9f903c82373d2e873c
Autor:
Piotr Niemiec
Publikováno v:
Colloquium Mathematicum. 166:75-106
A new category of topological spaces with additional structures, called m-towers, is introduced. It is shown that there is a covariant functor which establishes a one-to-one correspondences between unital (resp. arbitrary) subhomogeneous C*-algebras
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf3a110b87bd1b2670856c834acdbd15
https://doi.org/10.4064/cm7812-10-2020
https://doi.org/10.4064/cm7812-10-2020
Autor:
Uniwersytet Łódzki, Piotr Niemiec
Publikováno v:
Nafta-Gaz. 76:550-556
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0c078174a6862656a0ef868bed97de2
https://doi.org/10.18668/ng.2020.08.08
https://doi.org/10.18668/ng.2020.08.08
Autor:
Piotr Niemiec
Publikováno v:
Advances in Operator Theory. 5:950-993
It is shown that a positive (bounded linear) operator on a Hilbert space with trivial kernel is unitarily equivalent to a Hankel operator that satisfies double positivity condition if and only if it is non-invertible and has simple spectrum (that is,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da4c05c7a1d8d43c15de750f56961056
https://doi.org/10.1007/s43036-020-00058-6
https://doi.org/10.1007/s43036-020-00058-6
Autor:
Piotr Niemiec, Renata Tokarz-Sobieraj
Publikováno v:
Journal of Molecular Structure. 1135:20-25
Heteropolyacids systems (HPAs) exhibit a wide range of molecular sizes, compositions and architectures. Modification of those parameters leads to the creation of a structure that presents diverse chemical and catalytic features. In this paper, the th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f37c17136a49ff35b1df6dc2b4e1b8c0
https://doi.org/10.1016/j.molstruc.2016.12.046
https://doi.org/10.1016/j.molstruc.2016.12.046
Autor:
Piotr Niemiec, Piotr Pikul
A soft presentation of hyperbolic spaces, free of differential apparatus, is offered. Fifth Euclid's postulate in such spaces is overthrown and, among other things, it is proved that spheres (equipped with great-circle distances) and hyperbolic and E
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::23e2badc387b50aabe0bfb03c539335b
http://arxiv.org/abs/1801.07609
http://arxiv.org/abs/1801.07609
Autor:
Piotr Niemiec
Publikováno v:
Transactions of the American Mathematical Society. 366:2597-2623
Given a locally compact Polish space X, a necessary and sufficient condition for a group G of homeomorphisms of X to be the full isometry group of (X,d) for some proper metric d on X is given. It is shown that every locally compact Polish group G act
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8588574314643f3c16eaf87438da9267
https://doi.org/10.1090/s0002-9947-2013-05941-7
https://doi.org/10.1090/s0002-9947-2013-05941-7