A Lagrange multiplier theorem and a sandwich theorem for convex relations.
Mathematica Scandinavica, Tome 48 (1981), pp. 189-204.

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Mots-clés : Lagrange multiplier theorem, sandwich theorem, convex analysis, multifunctions, order complete vector space, open mapping, closed graph theorem, convex graph, Lagrange's multiplier theorem, subgradient formulas, Fenchel duality, constrained convex optimality
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     author = {J.M. Borwein},
     title = {A {Lagrange} multiplier theorem and a sandwich theorem for convex relations.},
     journal = {Mathematica Scandinavica},
     pages = {189--204},
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     volume = {48},
     year = {1981},
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J.M. Borwein. A Lagrange multiplier theorem and a sandwich theorem for convex relations.. Mathematica Scandinavica, Tome 48 (1981), pp. 189-204. http://geodesic.mathdoc.fr/item/MS2_1981__48_166749/