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Some remarks on the distributional Jacobian. (English) Zbl 1025.49030
In [Indiana Univ. Math. J. 51, No. 3, 645-677 (2002)] J. L. Jerrard and H. M. Soner proved a “weak” co-area formula involving distributional Jacobians. The author now proves a “strong” co-area type formula based on a chain rule for distributional Jacobians of some classes of maps.

##### MSC:
 49Q20 Variational problems in a geometric measure-theoretic setting 49J10 Existence theories for free problems in two or more independent variables
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##### References:
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