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Functional analysis
Theorems in functional analysis
Approximation theory
Banach algebras
Calculus of variations
Convex hulls
F-spaces
Function spaces
Functional analysts
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Integral equations
Integral representations
Integral transforms
Linear operators
Metric spaces
Noncommutative geometry
Nonlinear functional analysis
Operator theory
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Optimization in vector spaces
Sequence spaces
Topological vector spaces
Topological tensor products
Variational analysis
Wavelets
Helmut H. Schaefer
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