Adjacency preserving mappings of rectangular matrices.
Adjunctions in Monoidal categories.
Admissible estimators in the general multivariate linear model with respect to inequality restricted parameter set.
Admissible functions and asymptotics for labelled structures by number of components.
Advanced determinant calculus.
Aggregation/disaggregation iterative methods applied to Leontev systems and Markov chains
The paper surveys some recent results on iterative aggregation/disaggregation methods (IAD) for computing stationary probability vectors of stochastic matrices and solutions of Leontev linear systems. A particular attention is paid to fast IAD methods.
Aggregation/disaggregation method for safety models
The paper concerns the possibilities for mathematical modelling of safety related systems (equipment oriented on safety). Some mathematical models have been required by the present European Standards for the railway transport. We are interested in the possibility of using Markov’s models to meet these Standards. In the text an example of using that method in the interlocking equipment life cycle is given. An efficient aggregation/disaggregation method for computing some characteristics of Markov...
Alcune osservazioni sul rango numerico per operatori non lineari
We discuss some numerical ranges for Lipschitz continuous nonlinear operators and their relations to spectral sets. In particular, we show that the spectrum defined by Kachurovskij (1969) for Lipschitz continuous operators is contained in the so-called polynomial hull of the numerical range introduced by Rhodius (1984).
Alcune osservazioni sulle forme trilineari
Si studiano, nell'ambito della teoria delle forme trilineari, le cosidette -forme simmetriche, pervenendo ad un teorema di struttura utile per una possibile classificazione, ancora inesistente, di tali -forme.
Algebraic and topological properties of some sets in ℓ₁
For a sequence x ∈ ℓ₁∖c₀₀, one can consider the set E(x) of all subsums of the series . Guthrie and Nymann proved that E(x) is one of the following types of sets: () a finite union of closed intervals; () homeomorphic to the Cantor set; homeomorphic to the set T of subsums of where b(2n-1) = 3/4ⁿ and b(2n) = 2/4ⁿ. Denote by ℐ, and the sets of all sequences x ∈ ℓ₁∖c₀₀ such that E(x) has the property (ℐ), () and ( ), respectively. We show that ℐ and are strongly -algebrable and is -lineable. We...
Algebraic complexity theory. I: An introduction. (Algebraische Komplexitätstheorie. I: Eine Einführung.)
Algebraic complexity theory. II: Tast matrix multiplication and combinatorics. (Algebraische Komplexitätstheorie. II: Schnelle Matrixmultiplikation und Kombinatorik.)
Algebraic complexity theory. III: On the complexity of the computation of permanents. (Algebraische Komplexitätstheorie. III: Zur Berechnungskomplexität von Permanenten.)
Algebraic conditions for -tough graphs
We give some algebraic conditions for -tough graphs in terms of the Laplacian eigenvalues and adjacency eigenvalues of graphs.
Algebraic Connections and Curvature in Fibrations Bundles of Associative Algebras
In this article fibrations of associative algebras on smooth manifolds are investigated. Sections of these fibrations are spinor, co spinor and vector fields with respect to a gauge group. Invariant differentiations are constructed and curvature and torsion of invariant differentiations are calculated.
Algebraic Connections Between the Least Squares and Total Least Squares Problems.
Algebraic connectivity of -connected graphs
Let be a -connected graph with . A hinge is a subset of vertices whose deletion from yields a disconnected graph. We consider the algebraic connectivity and Fiedler vectors of such graphs, paying special attention to the signs of the entries in Fiedler vectors corresponding to vertices in a hinge, and to vertices in the connected components at a hinge. The results extend those in Fiedler’s papers Algebraic connectivity of graphs (1973), A property of eigenvectors of nonnegative symmetric...
Algebraic connectivity of trees with a pendant edge of infinite weight.
Algebraic Considerations on Powers of Stochastic Matrices
Algebraic matrix equations in systems theory