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Decision support system based on AHP and PROMETHEE under rough pythagorean fuzzy set information for selection of basketball team. [PDF]
Sci RepZhang C, Li G.
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Improving end-bearing capacity prediction of rock-socketed shafts using Gaussian-augmented optimized extreme gradient boosting models. [PDF]
Sci RepKhatti J, Fissha Y, Cheepurupalli NR.
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A MAGDM approach based on dual hesitant Q-rung orthopair fuzzy Dombi norm with Hamy mean operators and its application. [PDF]
Sci RepMa X, Wang M, Qin H, Wei Q, Li T.
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Surrogate model for statics of fractional thin bar element and its equivalence with mass-spring metamaterial. [PDF]
Sci RepSzajek K, Sumelka W.
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2023
AbstractWe discuss multiplication operators Mφf = φf on L2(μ), where μ is a finite positive Borel measure on a compact set in ℂ and φ is a μ-essentially bounded function. These operators represent normal operators on Hilbert spaces via the spectral theorem.
Stephan Ramon Garcia +2 more
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AbstractWe discuss multiplication operators Mφf = φf on L2(μ), where μ is a finite positive Borel measure on a compact set in ℂ and φ is a μ-essentially bounded function. These operators represent normal operators on Hilbert spaces via the spectral theorem.
Stephan Ramon Garcia +2 more
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Multiplicative Commutators of Operators
Canadian Journal of Mathematics, 1966An invertible operator T on a Hilbert space is a multiplicative commutator if there exist invertible operators A and B on such that T = ABA–1B–1. In this paper we discuss the question of which operators are, and which are not, multiplicative commutators.
Brown, Arlen, Pearcy, Carl
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Canadian Journal of Mathematics, 1989
Let V(x) ≧ 0 be given on Rn and defineThis constant has played a role in many investigation. For n — 3 it was shown in Courant-Hilbert [7] p. 446 that In [10], Kato estimates C2,2,2,ƛ(V) in terms of the L2 +L∞ norm of V in R3. Stummel [22] showed that C2,2,2,1(V) is bounded by in Rn, n > 2, provided α < 4. Browder [6] and Balslev [3] showed that
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Let V(x) ≧ 0 be given on Rn and defineThis constant has played a role in many investigation. For n — 3 it was shown in Courant-Hilbert [7] p. 446 that In [10], Kato estimates C2,2,2,ƛ(V) in terms of the L2 +L∞ norm of V in R3. Stummel [22] showed that C2,2,2,1(V) is bounded by in Rn, n > 2, provided α < 4. Browder [6] and Balslev [3] showed that
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2023
AbstractThis chapter concerns the multiplication operators Mx:L2[0,1]→L2[0,1],(Mxf)(x)=xf(x) and Mξ:L2(T)→L2(T),(Mξg)(ξ)=ξg(ξ). We discuss their spectra and invariant subspaces. This requires the introduction of Fourier series and the Hardy space H2.
Stephan Ramon Garcia +2 more
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AbstractThis chapter concerns the multiplication operators Mx:L2[0,1]→L2[0,1],(Mxf)(x)=xf(x) and Mξ:L2(T)→L2(T),(Mξg)(ξ)=ξg(ξ). We discuss their spectra and invariant subspaces. This requires the introduction of Fourier series and the Hardy space H2.
Stephan Ramon Garcia +2 more
openaire +1 more source