On the approximate solutions of functional equations in spaces
Dilating mappings, implicit functions and fixed point theorems in finite-dimensional spaces
Invariant subspaces of completely continuous operators in locally convex linear topological spaces
Inverse differentiability contractors and equations in Banach spaces
A general separation theorem for mappings, saddle-points duality and conjugate functions
Directional contractors and equations in Banach spaces
Mean ergodic theorem in locally convex linear topological spaces
On linear functional equations in ()-spaces
On linear functional equations in locally convex linear topological spaces
A general maximum principle for optimization problems
The cosine equation method for the eigenproblem of bounded normal operators in Hilbert space
A generalized gradient method of minimizing a functional
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