Geodesic
A boundary multivalued integral “equation” approach to the semipermeability problem
Applications of Mathematics, Tome 38 (1993) no. 1, pp. 39-60.

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The present paper concerns the problem of the flow through a semipermeable membrane of infinite thickness. The semipermeability boundary conditions are first considered to be monotone; these relations are therefore derived by convex superpotentials being in general nondifferentiable and nonfinite, and lead via a suitable application of the saddlepoint technique to the formulation of a multivalued boundary integral equation. The latter is equivalent to a boundary minimization problem with a small number of unknowns. The extension of the present theory to more general nonmonotone semipermeability conditions is also studied. Int the last section the theory is illustrated by two numerical examples.
DOI : 10.21136/AM.1993.104533
Classification : 35J85, 35R35, 49J40, 65N30, 76M30, 76M99, 76S05
Keywords: approximations of unilateral BVP; mixed and dual variational formulation of unilateral BVP; semipermeable membrane; infinite thickness; convex superpotentials; saddle-point technique; boundary minimization problem 
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Haslinger, Jaroslav; Baniotopoulos, C. C.; Panagiotopoulos, Panagiotis D. A boundary multivalued integral “equation” approach to the semipermeability problem. Applications of Mathematics, Tome 38 (1993) no. 1, pp. 39-60. doi : 10.21136/AM.1993.104533. http://geodesic.mathdoc.fr/articles/10.21136/AM.1993.104533/

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