Εμφανίζονται 1 - 20 Αποτελέσματα από 464.867 για την αναζήτηση 'constructive analytic function', χρόνος αναζήτησης: 1,07δλ Περιορισμός αποτελεσμάτων
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    Conference

    Συγγραφείς: Oliver, Madison, Crocker, Abigail

    Πηγή: 2026 IEEE International Systems Conference (SysCon) Systems Conference (SysCon), 2026 IEEE International. :1-8 Apr, 2026

    Relation: 2026 IEEE International Systems Conference (SysCon)

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    Mixed Materials

    Additional Titles: We prove exponential expressivity with stable ReLU Neural Networks (ReLU NNs) in $H^1(Ω)$ for weighted analytic function classes in certain polytopal domains $Ω$, in space dimension $d=2,3$. Functions in these classes are locally analytic on open subdomains $D\subset Ω$, but may exhibit isolated point singularities in the interior of $Ω$ or corner and edge singularities at the boundary $\partial Ω$. The exponential expression rate bounds proved here imply uniform exponential expressivity by ReLU NNs of solution families for several elliptic boundary and eigenvalue problems with analytic data. The exponential approximation rates are shown to hold in space dimension $d = 2$ on Lipschitz polygons with straight sides, and in space dimension $d=3$ on Fichera-type polyhedral domains with plane faces. The constructive proofs indicate in particular that NN depth and size increase poly-logarithmically with respect to the target NN approximation accuracy $\varepsilon>0$ in $H^1(Ω)$. The results cover in particular solution sets of linear, second order elliptic PDEs with analytic data and certain nonlinear elliptic eigenvalue problems with analytic nonlinearities and singular, weighted analytic potentials as arise in electron structure models. In the latter case, the functions correspond to electron densities that exhibit isolated point singularities at the positions of the nuclei. Our findings provide in particular mathematical foundation of recently reported, successful uses of deep neural networks in variational electron structure algorithms.

    Σύνδεσμος: http://arxiv.org/abs/2010.12217

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    Academic Journal

    Συγγραφείς: Deterding, Stephen1 (AUTHOR) deterding@marshall.edu

    Πηγή: Constructive Approximation. May2026, p1-12. 12p.

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    Mixed Materials

    Additional Titles: We study a quartic matrix model with partition function $Z=\int d\ M\exp{\rm Tr}\ (-ΔM^2-\fracλ{4}M^4)$. The integral is over the space of Hermitian $(Λ+1)\times(Λ+1)$ matrices, the matrix $Δ$, which is not a multiple of the identity matrix, encodes the dynamics and $λ>0$ is a scalar coupling constant. We proved that the logarithm of the partition function is the Borel sum of the perturbation series, hence is a well defined analytic function of the coupling constant in certain analytic domain of $λ$, by using the multi-scale loop vertex expansions. All the non-planar graphs generated in the perturbation expansions have been taken care of on the same footing as the planar ones. This model is derived from the self-dual $ϕ^4$ theory on the 2 dimensional Moyal space, also called the 2 dimensional Grosse-Wulkenhaar model. This would also be the first fully constructed matrix model which is non-trivial and not solvable.

    Συγγραφείς: Wang, Zhituo

    Σύνδεσμος: http://arxiv.org/abs/1805.06365

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    Academic Journal

    Συγγραφείς: García-Zamora, Diego1 (AUTHOR) dgzamora@ujaen.es, Dutta, Bapi2 (AUTHOR) bdutta@ujaen.es, Figueira, José Rui3 (AUTHOR) figueira@tecnico.ulisboa.pt, Martínez, Luis2 (AUTHOR) martin@ujaen.es

    Πηγή: European Journal of Operational Research. Nov2024, Vol. 319 Issue 1, p246-262. 17p.

    Συνδεδεμένο Πλήρες Κείμενο
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    Academic Journal

    Συγγραφείς: Manukyan, S. N.

    Περιγραφή αρχείου: application/xml

    Σύνδεσμος πρόσβασης: https://zbmath.org/4031686

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    Academic Journal

    Συγγραφείς: Trefethen, Lloyd N.1 (AUTHOR) trefethen@seas.harvard.edu

    Πηγή: Constructive Approximation. Aug2026, Vol. 64 Issue 1, p3-14. 12p.

    Συνδεδεμένο Πλήρες Κείμενο
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    Academic Journal

    Συγγραφείς: SALO, T. M.

    Πηγή: Matematychni Studii; 2025, Vol. 63 Issue 2, p129-135, 7p

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