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pro vyhledávání: '"Boguslaw Hajduk"'
Autor:
Boguslaw Hajduk, Aleksy Tralle
Publikováno v:
Annals of Global Analysis and Geometry. 28:337-349
We prove that there exist diffeomorphisms of tori, supported in a disc, which are not isotopic to symplectomorphisms with respect to any symplectic structure. This yields a partial negative answer to a question of Benson and Gordon about the existenc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e76e372fbdada965382d4753542c049
https://doi.org/10.1007/s10455-005-1939-0
https://doi.org/10.1007/s10455-005-1939-0
Autor:
Aleksy Tralle, Boguslaw Hajduk
We solve the problem posed by Boyer and Galicki about the existence of K-contact simply connected manifolds with no Sasakian structure. Although the result lies in the framework of metric contact geometry, our methods come from contact and symplectic
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::159a4c1db0e3d0ba065a90bda5fc5611
Autor:
Boguslaw Hajduk, Aleksy Tralle
We give a short proof of the (known) result that there are no Kaehler structures on exotic tori. This yields a negative solution to a problem posed by Benson and Gordon. W discuss the symplectic version of the problem and analyze results which yield
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c06cf8099776d5894d68d57928347916
http://arxiv.org/abs/math/0612586
http://arxiv.org/abs/math/0612586
Autor:
Rafal Walczak, Boguslaw Hajduk
Let $M^4$ be a smooth compact manifold with a free circle action generated by a vector field $X.$ Then for any invariant symplectic form $\omega$ on $M$ the contracted form $\iota_X \omega$ is nondegenerate. Using the map $\omega --> \iota_X \omega$
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99372348e09eba7f6606135c019956a3
Autor:
Rafal Walczak, Boguslaw Hajduk
Let X be a G-space such that the orbit space X/G is metrizable. Suppose a family of slices is given at each point of X. We study a construction which associates, under some conditions on the family of slices, with any metric on X/G an invariant metri
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e9675a211606274a64d6a2cbb79ad45
http://arxiv.org/abs/math/0105230
http://arxiv.org/abs/math/0105230
Autor:
Boguslaw Hajduk, Rafal Walczak
Publikováno v:
Transactions of the American Mathematical Society; May2006, Vol. 358 Issue 5, p1953-1970, 18p
Autor:
Tadeusz Januszkiewicz, Boguslaw Hajduk
Publikováno v:
Topology. (3):559-570
Polarized t-structures seem to be attractive topological objects. One readily sees how to define the notion of the cobordism between them. This cobordism group Qrr (in dimension 3) is our principal object of interest in this paper. When one looks for
Externí odkaz:
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