Linear Pfaffian Systems and Integrability Condition

Abstract In the space , 𝑛-dimensional surfaces are considered having the parametrizations which are functions of the Sobolev class with 𝑝 > 𝑛. The first and the second fundamental tensor are defined. The Peterson–Codazzi equations for such functions are understood in some generalized sense. It is proved that if the first and the second fundamental tensor of one surface are close to the first and, respectively, to the second fundamental tensor of the other surface, then these surfaces will be close up to the motion of the space . A difference between the fundamental tensors and the nearness of the surfaces are measured with the help of suitable 𝑊-norms. The proofs are based on a generalization of Frobenius' theorem about completely integrable systems of the differential equations which was proved by Yu. E. Borovskiĭ. The integral representations of functions by differential operators with complete integrability condition are used, which were elaborated by the author in his other works.

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An asymptotic treatment for non-convex fully nonlinear elliptic equations: Global Sobolev and BMO type estimates

Communications in Contemporary Mathematics ◽

10.1142/s0219199718500530 ◽

2019 ◽

Vol 21 (07) ◽

pp. 1850053 ◽

Cited By ~ 1

Author(s):

J. V. da Silva ◽

G. C. Ricarte

Keyword(s):

Elliptic Equations ◽

A Priori Estimates ◽

Integrability Condition ◽

A Priori ◽

Nonlinear Elliptic Equations ◽

Borderline Case ◽

Fully Nonlinear Elliptic Equations ◽

Fully Nonlinear ◽

Text Type ◽

Nonlinear Elliptic

In this paper, we establish global Sobolev a priori estimates for [Formula: see text]-viscosity solutions of fully nonlinear elliptic equations as follows: [Formula: see text] by considering minimal integrability condition on the data, i.e. [Formula: see text] for [Formula: see text] and a regular domain [Formula: see text], and relaxed structural assumptions (weaker than convexity) on the governing operator. Our approach makes use of techniques from geometric tangential analysis, which consists in transporting “fine” regularity estimates from a limiting operator, the Recession profile, associated to [Formula: see text] to the original operator via compactness methods. We devote special attention to the borderline case, i.e. when [Formula: see text]. In such a scenery, we show that solutions admit [Formula: see text] type estimates for their second derivatives.

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