A Lagrange multiplier theorem and a sandwich theorem for convex relations.
Borwein, J.M.
Mathematica Scandinavica, Tome 48 (1981), p. 189-204 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1981-01-01
EUDML-ID : urn:eudml:doc:166749 
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     title = {A Lagrange multiplier theorem and a sandwich theorem for convex relations.},
     journal = {Mathematica Scandinavica},
     volume = {48},
     year = {1981},
     pages = {189-204},
     zbl = {0468.49007},
     url = {http://dml.mathdoc.fr/item/GDZPPN002356600}
}

Borwein, J.M. A Lagrange multiplier theorem and a sandwich theorem for convex relations.. Mathematica Scandinavica, Tome 48 (1981) pp. 189-204. http://gdmltest.u-ga.fr/item/GDZPPN002356600/