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# Local Gradient Estimates for Second-Order Nonlinear Elliptic and Parabolic Equations by the Weak Bernstein's Method

Abstract : In the theory of second-order, nonlinear elliptic and parabolic equations, obtaining local or global gradient bounds is often a key step for proving the existence of solutions but it may be even more useful in many applications, for example to singular perturbations problems. The classical Bernstein's method is a well-known tool to obtain these bounds but, in most cases, it has the defect of providing only a priori estimates. The weak Bernstein's method'', based on viscosity solutions' theory, is an alternative way to prove the global Lipschitz regularity of solutions together with some estimates but it is not so easy to perform in the case of local bounds. The aim of this paper is to provide an extension of the weak Bernstein's method'' which allows to prove local gradient bounds with reasonnable technicalities.
Keywords :
Type de document :
Pré-publication, Document de travail

https://hal.archives-ouvertes.fr/hal-01526740
Contributeur : Guy Barles Connectez-vous pour contacter le contributeur
Soumis le : vendredi 27 août 2021 - 09:44:48
Dernière modification le : mardi 12 octobre 2021 - 17:20:53

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wbnl-new.pdf
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### Identifiants

• HAL Id : hal-01526740, version 2
• ARXIV : 1705.08673

### Citation

G Barles. Local Gradient Estimates for Second-Order Nonlinear Elliptic and Parabolic Equations by the Weak Bernstein's Method. 2021. ⟨hal-01526740v2⟩

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