One counterexample concerning the Fréchet differentiability of convex functions on closed sets
Acta Universitatis Carolinae. Mathematica et Physica, Tome 34 (1993) no. 2, pp. 97-105.

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Classification : 46G05, 46N10, 47H04, 47N10, 49J50 
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     author = {Matou\v{s}kov\'a, E.},
     title = {One counterexample concerning the {Fr\'echet} differentiability of convex functions on closed sets},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {97--105},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1993},
     mrnumber = {1282972},
     zbl = {1010.46500},
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Matoušková, E. One counterexample concerning the Fréchet differentiability of convex functions on closed sets. Acta Universitatis Carolinae. Mathematica et Physica, Tome 34 (1993) no. 2, pp. 97-105. https://geodesic-test.mathdoc.fr/item/AUCMP_1993__34_2_a13/