Geodesic
Discontinuous wave equations and a topological degree for some classes of multi-valued mappings
Applications of Mathematics, Tome 44 (1999) no. 1, pp. 15-32

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The Leray-Schauder degree is extended to certain multi-valued mappings on separable Hilbert spaces with applications to the existence of weak periodic solutions of discontinuous semilinear wave equations with fixed ends.
DOI : 10.1023/A:1022216119044
Classification : 35L05, 35L70, 47H17, 58C06
Keywords: discontinuous wave equations; topological degree; multi-valued mappings 
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Fečkan, Michal; Kollár, Richard. Discontinuous wave equations and a topological degree for some classes of multi-valued mappings. Applications of Mathematics, Tome 44 (1999) no. 1, pp. 15-32. doi: 10.1023/A:1022216119044

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