On effective presentations of formal concept lattices.
Morozov, A.S. (2009)
Sibirskij Matematicheskij Zhurnal
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Morozov, A.S. (2009)
Sibirskij Matematicheskij Zhurnal
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Bronshtejn, E.M. (2000)
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Lyudkovskij, S.V. (2000)
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Chekhlov, A.R. (2001)
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Baskakov, A.G., Pastukhov, A.I. (2001)
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Zelenyuk, E.G., Protasov, I.V. (2001)
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Tolstonogov, A.A. (2002)
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Popov, A.M. (2006)
Sibirskie Ehlektronnye Matematicheskie Izvestiya [electronic only]
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Popov, A.M. (2006)
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Yakymiv, A.L. (2006)
Publications de l'Institut Mathématique. Nouvelle Série
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Mazurov, V. D. (2003)
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A. L. Yakymiv (2006)
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Isaeva, O.V., Medvedev, N.Ya. (2000)
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Hans-Joachim Baues, Manfred Hartl (1996)
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The homotopy category of Moore spaces in degree 2 represents a nontrivial cohomology class in the cohomology of the category of abelian groups. We describe various properties of this class. We use James-Hopf invariants to obtain explicitly the image category under the functor chain complex of the loop space.
Sibert, H. (2000)
Siberian Mathematical Journal
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Kenzi Satô (1998)
Acta Arithmetica
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For every positive rational number q, we find a free group of rotations of rank 2 acting on (√q𝕊²) ∩ ℚ³ whose all elements distinct from the identity have no fixed point.