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Two methods for discretizing a delta function supported on a level set. (English) Zbl 1115.65028
Let \(f:{\mathbb R}^n \to {\mathbb R}\) and \(u:{\mathbb R}^n \to {\mathbb R}\) be smooth functions which are given by their data on a grid. Let \(\Gamma\) be the zero level set of \(u\). The author considers the problem of approximating the integral \(\int_{\Gamma} f(x)\,ds\). It is common practice to replace the integral above by \[ \int_{{\mathbb R}^n} f(x)\, \delta(u(x))\,\| \nabla u(x)\| \, dx, \] where \(\delta\) denotes the Dirac delta function. Then one approximates this integral using the available grid-defined function values. The author proposes two methods for discretization of \(\delta(u(x))\).

MSC:
65D32 Numerical quadrature and cubature formulas
58C35 Integration on manifolds; measures on manifolds
46F10 Operations with distributions and generalized functions
41A55 Approximate quadratures
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