A C1 function which is nowhere strongly paraconvex and nowhere semiconcave
Control and Cybernetics, Tome 36 (2007) no. 3, pp. 803-810.

Voir la notice de l'article provenant de la source The Polish Digital Mathematics Library

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     author = {Zaj{\'\i}\v{c}ek, Lud\v{e}k},
     title = {A {C1} function which is nowhere strongly paraconvex and nowhere semiconcave},
     journal = {Control and Cybernetics},
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     volume = {36},
     number = {3},
     year = {2007},
     zbl = {1173.26309},
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Zajíček, Luděk. A C1 function which is nowhere strongly paraconvex and nowhere semiconcave. Control and Cybernetics, Tome 36 (2007) no. 3, pp. 803-810. http://geodesic.mathdoc.fr/item/CC_2007_36_3_a20/