Results 131 to 140 of about 371 (169)

A Generalized Commutativity Theorem

Zeitschrift für Analysis und ihre Anwendungen, 1991
Summary: Let \(H\) be a complex separable Hilbert space, \({\mathcal C}\) the class of contractions with \(C_{\cdot 0}\) completely non-unitary parts, \({\mathcal C}_ 0\) the class of \(A\in {\mathcal C}\) which satisfy the property (called property (P2)) that if the restriction of \(A\) to an invariant subspace \(M\) is normal, then \(M\) reduces \(A\)
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Opechowskis theorem and commutator groups

Journal of Physics A: Mathematical and General, 1986
Given the definition of the double point groups, \textit{W. Opechowski} [Physica 7, 552-562 (1940; Zbl 0023.30201)] proved that if a finite group \({\mathcal G}\) as a subgroup of the three-dimensional rotation group \({\mathcal S}{\mathcal O}(2)\), possesses two rotations by angle \(\pi\) around two mutually perpendicular axes, then the number of ...
Caride, A. O., Zanette, S. I.
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The Commutation’s Theorem

2011
We show that for a locally compact unimodular group G, every T e CV 2(G) is the limit of convolution operators associated to bounded measures.
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Other Commutation Theorems

1985
In order to clarify this Chapter, we will be concerned first with an ultraweakly closed space A with condition II, of the form A = Un≥ M Δn × Δn (where Δ ≥ Id is a self-adjoint operator affiliated to a given von Neumann algebra M). This will enable us to deal more simply with an ultraweakly closed space A with condition II and cofinal abelian sequence.
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Differential invariants: theorem of commutativity

Communications in Nonlinear Science and Numerical Simulation, 2004
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The Commutant Lifting Theorem

1990
In this chapter we will introduce the main theorem of this monograph, namely, the Commutant Lifting Theorem and we will give several different proofs for it. Each proof illuminates different features of this theorem. We also use the second proof to discuss the uniqueness question in the commutant lifting theorem.
Ciprian Foias, Arthur E. Frazho
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Möbius' theorem and commutativity

Journal of Geometry, 1997
Let \(A_0A_1A_2A_3\) and \(B_0B_1B_2B_3\) be any two nondegenerate tetrahedra in the three-dimensional projective space \(P_3(F)\) over a field \(F\), which are situated in such a way that \(B_i\in\alpha_i\), \(B_i\not\in\alpha_j\) for \(i\neq j\) \((i,j= 0,1,2,3)\) and \(A_i\in\beta_i\) for \(i= 0,1,2\), where \(\alpha_i(\beta_i)\) is the plane ...
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Commutativity theorems for s-unital rings with constraints on commutators

Results in Mathematics, 1992
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Abujabal, Hamza A. S., Perić, Veselin
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Integrative oncology: Addressing the global challenges of cancer prevention and treatment

Ca-A Cancer Journal for Clinicians, 2022
Jun J Mao,, Msce, Lorenzo Cohen, Karen M Mustian   +2 more
exaly  

About Tietze's non commutative theorem

1999
Summary: Let \(\pi:{\mathcal A}\to{\mathcal B}\) be a surjective morphism between the \(C^*\)-algebras \({\mathcal A}\) and \({\mathcal B}\). Using the technic of quasi-central approximate units we give what is, we hope, a new short proof of the existence of a surjective morphism \(\overline\pi\) between the multiplier algebras \({\mathcal M}({\mathcal
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