Funktionalgleichungen in reellen Verktorräumen und verallgemeinerte Cauchy-Riemannsche Differentialgleichungen, speziell die Weylsche Gleichung des Neutrinos. (Short Communication).
Galerkin Method and Optimal Error Algorithms in Hilbert Spaces.
Generalization of formulae of Fredholm type
Improving the convergence of iterative methods
The author considers the operator equation . Methods for acceleration of convergence of the iterative process are investigated.
Inner spectral radius of positive operator matrices.
Iterations converging to distinct solutions of some nonlinear operator equations in Banach space.
Logarithmic and antilogarithmic mappings [Book]
Necessary conditions for normal solvability in duals of LF-spaces.
Nonhermitian systems and pseudospectra
Four applications are outlined of pseudospectra of highly nonnormal linear operators.
Norm inequalities in star algebras.
On a class of nonlinear eigenvalue problems
On a Method of Moments
On a problem of moments of S. Rolewicz
On existence of solutions to degenerate nonlinear optimization problems
We investigate the existence of the solution to the following problem min φ(x) subject to G(x)=0, where φ: X → ℝ, G: X → Y and X,Y are Banach spaces. The question of existence is considered in a neighborhood of such point x₀ that the Hessian of the Lagrange function is degenerate. There was obtained an approximation for the distance of solution x* to the initial point x₀.
On Kato non-singularity
An exactness lemma offers a simplified account of the spectral properties of the "holomorphic" analogue of normal solvability.
On Morozov's method for Tikhonov regularization as an optimal order yielding algorithm.
On operator valued solutions of d'Alembert's functional equation, II
On quasiparabolical differential equations of higher order
On Some Classes Of Linear Equations
On some classes of linear equations.