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Inégalité isopérimétrique et calibration. (Isoperimetric inequality and calibration). (French) Zbl 0830.49029
Summary: We show that the isoperimetric inequality for a domain in the Euclidean plane, the two-dimensional sphere, or the two-dimensional hyperbolic space, may be obtained using a calibration.
49Q20 Variational problems in a geometric measure-theoretic setting
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