# Search results

Archiv der Mathematik > 2019 > 113 > 6 > 629-647

Mathematische Zeitschrift > 2019 > 293 > 3-4 > 903-933

Proceedings - Mathematical Sciences > 2019 > 129 > 5 > 1-12

Lobachevskii Journal of Mathematics > 2019 > 40 > 5 > 667-675

*C**-algebra for the additive semigroup of non-negative integers. It is known that every partially ordered set can be represented as the union of the family of its maximal upward directed subsets indexed by elements of some set...

Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 469-478

*C**-algebra for the additive semigroup of non-negative integers. This article deals with inductive systems of Toeplitz algebras over arbitrary directed sets. For such a system the family of its connecting injective *-homomorphisms is defined by a set of natural numbers satisfying a factorization property. The motivation for the study of those inductive...

Integral Equations and Operator Theory > 2019 > 91 > 3 > 1-30

*m*-isometric if and only if its generator satisfies a certain condition, which we choose to call

*m*-skew-symmetry. This paper contains two main results: We provide a Lumer–Phillips type characterization of generators of

*m*-isometric semigroups. This is based on the simple observation that

*m*-isometric semigroups are quasicontractive...

Mediterranean Journal of Mathematics > 2019 > 16 > 2 > 1-11

*p*-converging operators ($$1<p<\infty $$ 1<p<∞ ), $${\mathcal {G}}$$ G of Grothendieck operators, and $${\mathcal {H}}$$ H of $$c_0$$ c0 -cosingular operators....

Archiv der Mathematik > 2019 > 113 > 1 > 53-57

*F*the matrix algebra $$M_n(F)$$ M n ( F ) is the only algebra in $$M_n(F)$$ M n ( F ) which is spanned by an irreducible semigroup of triangularizable matrices. In other words, for a semigroup of triangularizable matrices with entries from a general field irreducibility...

Japan Journal of Industrial and Applied Mathematics > 2019 > 36 > 2 > 325-355

Czechoslovak Mathematical Journal > 2019 > 69 > 2 > 545-569

*u*

_{t}(

*t*) +

*Au*(

*t*) =

*f*(

*t, u*(

*t*)), 0 ⩽

*t < τ*with

*u*(

*τ*) =

*φ*, where

*A*is a densely defined positive self-adjoint unbounded operator on a Hilbert space, is ill-posed in the sense that small perturbations in the final value can lead to large deviations in the solution. We show, under suitable conditions on

*φ*and

*f*, that a solution of the...

Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences) > 2019 > 54 > 4 > 191-194

*i*,

*j*}-interassociative to the free semigroup and the free commutative semigroup, where

*i*,

*j*= 1, 2, 3.

Journal of the Indian Society for Probability and Statistics > 2019 > 20 > 1 > 89-107

Mathematical Methods in the Applied Sciences > 41 > 16 > 6895 - 6906

*I*and type

*I*

*I*thermoelastic system with infinite memory acting in the second part. The main contributions are to show that the infinite memory lets our problem dissipative and that the

*t*

^{−1}is the sharp decay rate. That is to show that, for this types of materials, the dissipation produced by the viscoelastic part...

Journal of Fixed Point Theory and Applications > 2018 > 20 > 4 > 1-30

Aequationes mathematicae > 2018 > 92 > 6 > 1001-1035

Russian Mathematics > 2018 > 62 > 10 > 37-46

*C**-algebras and continue the previously initiated research of the

*C**-algebra generated by the left regular representation of an abelian semigroup. We study the invariant ideals of this

*C**-algebra invariant with respect to the representation of a compact group

*G*in the automorphism group of this algebra. We prove that the invariance of the ideal is equivalent...

Information Sciences > 2018 > 460-461 > C > 42-50

Journal of Mathematical Sciences > 2018 > 234 > 1 > 21-34

*X*is called an

*upfamily*, if, for each set A∈A $$ A\in \mathcal{A} $$

*;*any set

*B*⊃

*A*belongs to A $$ \mathcal{A} $$. An upfamily ℒ $$ \mathrm{\mathcal{L}} $$ is called

*k-linked*, if ∩ℱ≠∅ $$ \cap \mathrm{\mathcal{F}}\ne \varnothing $$ for any subfamily ℱ⊂ℒ $$ \mathrm{\mathcal{F}}\subset \mathrm{\mathcal{L}} $$ of cardinality ℱ≤k $$ \left|\mathrm{\mathcal{F}}\right|\le...

Journal of Statistical Physics > 2018 > 173 > 1 > 77-98