Results 111 to 120 of about 673 (226)
Automated Bandwidth Selection for Inference in Linear Models With Time‐Varying Coefficients
Journal of Time Series Analysis, Volume 47, Issue 4, Page 854-875, July 2026.ABSTRACT The problem of selecting the smoothing parameter, or bandwidth, for kernel‐based estimators of time‐varying coefficients in linear models with possibly endogenous explanatory variables is considered. We examine automated bandwidth selection by means of cross‐validation, a nonparametric variant of Akaike's information criterion, and bootstrap ...
Charisios Grivas, Zacharias Psaradakis
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Pointwise multipliers for reverse Hölder spaces. II
, 1995 The author completes work begun in [Stud. Math. 109, No. 1, 23-39 (1994; Zbl 0844.42008)]. Let \(\Omega\) be an open subset of \(R^n\). A cube \(Q\) is always assumed to have faces perpendicular to the coordinate axes, and its length is denoted \(l(Q)\). If \(t>0\), \(tQ\) is the cube concentric with \(Q\) such that \(l(tQ) = tl(Q)\).
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Random Diophantine equations in the primes
Mathematika, Volume 72, Issue 3, July 2026.Abstract We consider equations of the form a1x1k+⋯+asxsk=0$a_{1}x_{1}^{k}+\cdots +a_{s}x_{s}^{k}=0$ where the variables xi$x_{i}$ are all taken to be primes. We define an analogue of the Hasse principle for solubility in the primes (which we call the prime Hasse principle), and prove that, whenever k⩾2$k\geqslant 2$, s⩾3k+2$s\geqslant 3k+2$, this holds
Philippa Holdridge
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Quantitative asymptotics for polynomial patterns in the primes
Mathematika, Volume 72, Issue 3, July 2026.Abstract We prove quantitative estimates for averages of the von Mangoldt and Möbius functions along polynomial progressions n+P1(m),…,n+Pk(m)$n+P_1(m),\ldots, n+P_k(m)$ for a large class of polynomials Pi$P_i$. The error terms obtained save an arbitrary power of logarithm, matching the classical Siegel–Walfisz error term.
Lilian Matthiesen +2 more
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Pointwise Multipliers on the Morrey Spaces
Pointwise Multipliers on the Morrey SpacesA function g is called a pointwise multiplier from L^p〓to L^p〓, if the pointwise product fg belongs to L^p〓for each f∈L^p〓. We denote by PWM(L^p〓, Lp〓) the set of all pointwise multipliers from L^p〓to L^p〓. It is known that PWM(L^p〓, L^p〓)=L^p〓, 1/p〓+1/p〓=1/p〓. The purpose of this paper is to generalize the above equality to the Morrey spaces on spaces
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Are West African Heat‐Lows Analogous to Dry Tropical Cyclones?
International Journal of Climatology, Volume 46, Issue 8, 30 June 2026.Heat‐lows qualitatively resemble dry tropical cyclones (TCs), though their underlying physics has yet to be compared. In this study, we show that West African transient heat‐low climatology correlates well with TC potential intensity generalised over land.
Aaron Kruskie +2 more
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Combining deep learning with a kinetic model to predict dynamic PET images and generate parametric images. [PDF]
EJNMMI Phys, 2023 Liang G +8 more
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Pointwise multipliers on Musielak-Orlicz spaces
, 2016 We consider the pointwise multipliers on Musielak-Orlicz spaces. We treat a wide class of Musielak-Orlicz spaces with generalized Young functions which include quasi-normed spaces.
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On the Meaning of Localization in Non‐Local Quantum Field Theory
Annalen der Physik, Volume 538, Issue 6, June 2026.In non‐local quantum field theory nature does not necessarily allow objects or events to be localized to exact mathematical points. Instead any physical measurement has a built‐in finite resolution set by the non‐locality scale. Spacetime remains continuous and Lorentz‐covariant, but below this scale pointlike localization becomes an idealization ...
E. J. Thompson
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Pointwise Multipliers on the Lorentz Spaces
Pointwise Multipliers on the Lorentz SpacesL^p 〓spaces ...
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