Results 141 to 150 of about 73,865 (284)

COMMUTANTS AND DOUBLE COMMUTANTS OF REFLEXIVE ALGEBRAS

Kyushu Journal of Mathematics, 1996
The author studies the commutant and the double commutant of the algebra \(\text{alg }{\mathcal L}\) of all bounded operators on a Banach space \(X\) leaving invariant each member of a lattice \({\mathcal L}\) of subspaces of \(X\). For example, he proves that when \({\mathcal L}\) is the pentagon subspace lattice, then the only operators commuting ...
openaire   +3 more sources

Local multiplicativity of perverse filtrations

Transactions of the London Mathematical Society, Volume 13, Issue 1, December 2026.
Abstract Let f:S→C$f:S\rightarrow C$ be a proper surjective morphism from a smooth Kähler surface to a smooth curve. We show that the local perverse filtration associated with the induced map S[n]→C(n)$S^{[n]}\rightarrow C^{(n)}$ is multiplicative on each fiber if and only if f$f$ is an elliptic fibration.
Zili Zhang
wiley   +1 more source

Commutativity of near-rings with (σ;τ)-derivations

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2013
In this paper we study some conditions under which a near-ring R admitting a (multiplicative) (σ; τ )-derivation d must be a commutative ring with constrained-suitable conditions on d, σ and τ.
Kamal Ahmed A. M., Al-Shaalan Khalid H.
doaj   +1 more source

Satisfiability of commutative vs. non-commutative CSPs

CoRR
v2: the main result now omits one case, but also includes infinite-dimensional operators v3: more discussion and comments on related work; v4: full version of an ICALP 2025 ...
Bulatov, Andrei A., Živný, Stanislav
openaire   +5 more sources

The mod 2 Seiberg–Witten invariants of spin structures and spin families

Journal of Topology, Volume 19, Issue 4, December 2026.
Abstract We completely determine the mod 2 Seiberg–Witten invariants for any spin structure on any closed, oriented, smooth 4‐manifold X$X$. Our computation confirms the validity of the simple‐type conjecture mod 2 for spin structures. Our proof also works for families of spin 4‐manifolds and thus computes the mod 2 Seiberg–Witten invariants for spin ...
David Baraglia
wiley   +1 more source

Commutativity and spectral properties of genuine Baskakov-Durrmeyer type operators and their \(k\)th order Kantorovich modification

Journal of Numerical Analysis and Approximation Theory, 2015
In this paper we present an overview of commutativity results and different methods for the proofs for  Baskakov-Durrmeyer type operators and associated differential operators.
Margareta Heilmann
doaj   +2 more sources

ON (α; τ)-P-DERIVATIONS OF NEAR-RINGS [PDF]

Journal of Algebraic Systems
The relationship between derivations and algebraic structures of quotient near-rings has become a fascinating topic in modern algebra in recent decades. Assume $\mathcal{N}$ is a near-ring and $P$ is its prime ideal. In this paper we introduce the notion
Samir Mouhssine, Abdelkarim Boua
doaj   +1 more source

Unimodular Commutators [PDF]

Proceedings of the American Mathematical Society, 1987
Let R R be a principal ideal ring and
openaire   +1 more source

Nontrivial Massey products on compact Kähler manifolds

Journal of Topology, Volume 19, Issue 4, December 2026.
Abstract By a result of Deligne, Griffiths, Morgan, and Sullivan, compact Kähler manifolds are rationally formal. In contrast to this, we show that the pluripotential quasi‐isomorphism type of the bigraded, bidifferential algebra of forms on a compact Kähler manifold generally contains more information than the de Rham cohomology algebra with its real ...
Giovanni Placini, Jonas Stelzig, Leopold Zoller   +2 more
wiley   +1 more source

RESULTS ON QUOTIENT NEAR-RINGS INVOLVING ADDITIVE MAPS [PDF]

Journal of Algebraic Systems
We consider N to be a 3-prime field and P to be a prime ideal of N : In this paper, we studythe commutativity of the quotient ring N =P with left multipliers and derivations satisfying certainidentities on P, generalizing some well-known results in the ...
Abderrahmane Raji, Abdelkarim Boua, Abdelilah Zerbane   +2 more
doaj   +1 more source