We study the solvability of the equation a(x) = f(x) on a sphere in a Banach space, where a is a closed surjective linear operator and f is an odd a-compact map. We also estimate the topological dimension of the solution set and give applications of the corresponding theorem to some problems in differential equations and other fields of mathematics.
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Sao Paulo Univ USP, Dept Matemat, Inst Ciencias Matemat & Comp, Campus Sao Carlos, BR-13560970 Sao Carlos, SP, BrazilSao Paulo State Univ Unesp, Inst Geosci & Exact Sci, Dept Matemat, BR-13506700 Rio Claro, SP, Brazil
Biasi, Carlos
Libardi, Alice Kimie Miwa
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Sao Paulo State Univ Unesp, Inst Geosci & Exact Sci, Dept Matemat, BR-13506700 Rio Claro, SP, BrazilSao Paulo State Univ Unesp, Inst Geosci & Exact Sci, Dept Matemat, BR-13506700 Rio Claro, SP, Brazil
Libardi, Alice Kimie Miwa
de Mattos, Denise
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Sao Paulo Univ USP, Dept Matemat, Inst Ciencias Matemat & Comp, Campus Sao Carlos, BR-13560970 Sao Carlos, SP, BrazilSao Paulo State Univ Unesp, Inst Geosci & Exact Sci, Dept Matemat, BR-13506700 Rio Claro, SP, Brazil
de Mattos, Denise
Ura, Sergio Tsuyoshi
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Sao Paulo State Univ Unesp, Inst Geosci & Exact Sci, Dept Matemat, BR-13506700 Rio Claro, SP, BrazilSao Paulo State Univ Unesp, Inst Geosci & Exact Sci, Dept Matemat, BR-13506700 Rio Claro, SP, Brazil