Geodesic
Hadamard inverse function theorem proved by variational analysis
Serdica Mathematical Journal, Tome 49 (2023) no. 1–3, pp. 97-106.

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We present a proof of Hadamard Inverse Function Theorem by the methods of Variational Analysis, adapting an idea of I. Ekeland and E. Séré.
Keywords: inverse function, variational analysis, 47J07, 47J30 
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Ivanov, Milen; Zlateva, Nadia. Hadamard inverse function theorem proved by variational analysis. Serdica Mathematical Journal, Tome 49 (2023) no. 1–3, pp. 97-106. http://geodesic.mathdoc.fr/item/SMJ2_2023_49_1_3_a5/