OnS-matrix models of weak interactions

On Nonlinear Preservers of Weak Matrix Majorization

Restrictions on Models of Tiie Weak Interactions*

The constraints which present data and a few, plausible theoretical assumptions impose upon quark-lepton models of the weak interactions are analyzed. While study of a given type of experiment usually allows many models, among all possible SU(2) x U(1) models few survive if all data and these theoretical restrictions are used. It is shown that even these few could be eliminated by data expected...

Bernoulli matrix approach for matrix differential models of first-order

The current paper contributes a novel framework for solving a class of linear matrix differential equations. To do so, the operational matrix of the derivative based on the shifted Bernoulli polynomials together with the collocation method are exploited to reduce the main problem to system of linear matrix equations. An error estimation of presented method is provided. Numerical experiments are...

Arens Regularity and Weak Amenability of Certain Matrix Algebras

Motivated by an Arens regularity problem, we introduce the concepts of matrix Banach space and matrix Banach algebra. The notion of matrix normed space in the sense of Ruan is a special case of our matrix normed system. A matrix Banach algebra is a matrix Banach space with a completely contractive multiplication. We study the structure of matrix Banach spaces and matrix Banach algebras. Then we...

Evolutionary diversification of protein-protein interactions by interface add-ons.

Cells contain a multitude of protein complexes whose subunits interact with high specificity. However, the number of different protein folds and interface geometries found in nature is limited. This raises the question of how protein-protein interaction specificity is achieved on the structural level and how the formation of nonphysiological complexes is avoided. Here, we describe structural el...