The cosine functional equation for nilpotent groups. (Short Communication).
The Equation F(F(x, y), F(z, y)) = F(x, z).
The Euler-Maclaurin sum formula for an inner derivation.
The Feigenbaum functional equation and periodic points.
The Feigenbaum functional equation and periodic points. (Short Communication).
The fixed point method for fuzzy approximation of a functional equation associated with inner product spaces.
The functional equation F(ax) + F(bx+a) = F(bx) + F(ax+b), entire and almost periodic solutions.
The functional equation f(xy) = ff(x) xy ff(y) in a partially ordered monoid.
The functional equation of distance preservance in spaces over rings.
The functional equation of distance preservance in spaces over rings. (Short Communication).
The fundamental equation of information and its generalizations.
The general linear equation on vector spaces.
The general solution of a functional equation in two variables.
The general solution of a functional equation related to the mixed theory of information.
The general solution of the generalized Schilling's equation.
The generalized Cauchy equation for operator-valued functions.
The generalized Cauchy equation for operator-valued functions. (Short Communication).
The generalized Hyers-Ulam-Rassias stability of a quadratic functional equation.
The geometry of convex cones associated with the Lyapunov inequality and the common Lyapunov function problem.
The Hyers-Ulam stability for two functional equations in a single variable.