Rank of matrices and the Pexider equation.
Preservers of the rank of matrices over a field.
Sur les paires d'équations pré-Schröder et leur équivalence
Pairs of functional pre-Schröder equations (Sₙ) are considered. We show that under some assumptions the system of two equations (S₃), (Sₙ) for some n ≥ 4 is equivalent to the system of all equations (Sₙ) for n ≥ 2. The results answer a question of Gy. Targonski [5] in a particular case.
On the monotonicity of solutions of certain types of functional-differential equations
Les relations entre les équations pré-Schröder I
Les relations entre les équations pré-Schröder II
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