An elementary proof of the polar factorization of vector-valued functions
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Tài liệu tham khảo
Y. Brenier, Polar factorization and monotone rearrangement of vector-valued functions, Comm. Pure Appl. Math. 46, 375?417 (1991).
Y. Brenier, D�composition polaire et r�arrangement monotone des champs de vecteurs, C. R. Acad. Sci. Paris 305, S�rie I, 805?808, (1987).