Central European Journal of Mathematics

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Anti-invariant Riemannian submersions from almost Hermitian manifolds
Central European Journal of Mathematics - Tập 8 - Trang 437-447 - 2010
Bayram Ṣahin
We introduce anti-invariant Riemannian submersions from almost Hermitian manifolds onto Riemannian manifolds. We give an example, investigate the geometry of foliations which are arisen from the definition of a Riemannian submersion and check the harmonicity of such submersions. We also find necessary and sufficient conditions for a Langrangian Riemannian submersion, a special anti-invariant Riema...... hiện toàn bộ
Hilbert algebras as implicative partial semilattices
Central European Journal of Mathematics - Tập 5 - Trang 264-279 - 2007
Jānis Cīrulis
The infimum of elements a and b of a Hilbert algebra are said to be the compatible meet of a and b, if the elements a and b are compatible in a certain strict sense. The subject of the paper will be Hilbert algebras equipped with the compatible meet operation, which normally is partial. A partial lower semilattice is shown to be a reduct of such an expanded Hilbert algebra i ?both algebras have th...... hiện toàn bộ
F-limit points in dynamical systems defined on the interval
Central European Journal of Mathematics - - 2012
Piotr Szuca
Given a free ultrafilter p on ℕ we say that x ∈ [0, 1] is the p-limit point of a sequence (x n ) n∈ℕ ⊂ [0, 1] (in symbols, x = p -lim n∈ℕ x n ) if for every neighbourhood V of x, {n ∈ ℕ: x n ...... hiện toàn bộ
The Lindelöf number of C p (X)×C p (X) for strongly zero-dimensional X
Central European Journal of Mathematics - Tập 9 Số 5 - Trang 978-983 - 2011
Oleg Okunev
The structure and representation of n-ary algebras of DNA recombination
Central European Journal of Mathematics - Tập 9 - Trang 1193-1216 - 2011
Sergei R. Sverchkov
In this paper we investigate the structure and representation of n-ary algebras arising from DNA recombination, where n is a number of DNA segments participating in recombination. Our methods involve a generalization of the Jordan formalization of observables in quantum mechanics in n-ary splicing algebras. It is proved that every identity satisfied by n-ary DNA recombination, with no restriction ...... hiện toàn bộ
Rank 4 vector bundles on the quintic threefold
Central European Journal of Mathematics - Tập 3 - Trang 404-411 - 2005
Carlo Madonna
By the results of the author and Chiantini in [3], on a general quintic threefold X⊂P 4 the minimum integer p for which there exists a positive dimensional family of irreducible rank p vector bundles on X without intermediate cohomology is at least three. In this paper we show that p≤4, by constructing series of positive dimensional families of rank 4 vector bundles on X without in...... hiện toàn bộ
Boundaries of weak peak points in noncommutative algebras of Lipschitz functions
Central European Journal of Mathematics - Tập 10 - Trang 646-655 - 2011
Kassandra Averill, Ann Johnston, Ryan Northrup, Robert Silversmith, Aaron Luttman
It has been shown that any Banach algebra satisfying ‖f 2‖ = ‖f‖2 has a representation as an algebra of quaternion-valued continuous functions. Whereas some of the classical theory of algebras of continuous complex-valued functions extends immediately to algebras of quaternion-valued functions, similar work has not been done to analyze how the theory of algebras of complex-valued L...... hiện toàn bộ
Some versions of limit and Dieudonné-type theorems with respect to filter convergence for (ℓ)-group-valued measures
Central European Journal of Mathematics - Tập 9 Số 6 - Trang 1298-1311 - 2011
Antonıo Boccuto, Xenofon Dimitriou, N. Papanastassiou
On stable least squares solution to the system of linear inequalities
Central European Journal of Mathematics - Tập 5 - Trang 373-385 - 2007
Evald Übi
The system of inequalities is transformed to the least squares problem on the positive ortant. This problem is solved using orthogonal transformations which are memorized as products. Author’s previous paper presented a method where at each step all the coefficients of the system were transformed. This paper describes a method applicable also to large matrices. Like in revised simplex method, in t...... hiện toàn bộ
The L q spectra and Rényi dimension of generalized inhomogeneous self-similar measures
Central European Journal of Mathematics - Tập 12 - Trang 1305-1319 - 2014
Przemysław Liszka
Very recently bounds for the L q spectra of inhomogeneous self-similar measures satisfying the Inhomogeneous Open Set Condition (IOSC), being the appropriate version of the standard Open Set Condition (OSC), were obtained. However, if the IOSC is not satisfied, then almost nothing is known for such measures. In the paper we study the L ...... hiện toàn bộ
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