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• W2115487765 abstract "Abstract We analyze a class of weakly differentiable vector fields F : ℝ n → ℝ n with the property that F ∈ L ∞ and div F is a (signed) Radon measure. These fields are called bounded divergence‐measure fields . The primary focus of our investigation is to introduce a suitable notion of the normal trace of any divergence‐measure field F over the boundary of an arbitrary set of finite perimeter that ensures the validity of the Gauss‐Green theorem. To achieve this, we first establish a fundamental approximation theorem which states that, given a (signed) Radon measure μ that is absolutely continuous with respect to ℋ︁ N − 1 on ℝ N , any set of finite perimeter can be approximated by a family of sets with smooth boundary essentially from the measure‐theoretic interior of the set with respect to the measure ||μ||, the total variation measure. We employ this approximation theorem to derive the normal trace of F on the boundary of any set of finite perimeter E as the limit of the normal traces of F on the boundaries of the approximate sets with smooth boundary so that the Gauss‐Green theorem for F holds on E . With these results, we analyze the Cauchy flux that is bounded by a nonnegative Radon measure over any oriented surface (i.e., an ( N − 1)‐dimensional surface that is a part of the boundary of a set of finite perimeter) and thereby develop a general mathematical formulation of the physical principle of the balance law through the Cauchy flux. Finally, we apply this framework to the derivation of systems of balance laws with measure‐valued source terms from the formulation of the balance law. This framework also allows the recovery of Cauchy entropy flux through the Lax entropy inequality for entropy solutions of hyperbolic conservation laws. © 2008 Wiley Periodicals, Inc." @default.
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• W2115487765 date "2008-08-01" @default.
• W2115487765 modified "2023-10-15" @default.
• W2115487765 title "Gauss-Green theorem for weakly differentiable vector fields, sets of finite perimeter, and balance laws" @default.
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• W2115487765 doi "https://doi.org/10.1002/cpa.20262" @default.
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