Mathematics – Classical Analysis and ODEs
Scientific paper
2005-12-11
Aequationes Mathematicae, Vol. 74, No. 3, 2007, 242-248
Mathematics
Classical Analysis and ODEs
6 pages
Scientific paper
We prove a uniqueness theorem for a large class of functional equations in the plane, which resembles in form a classical result of Aczel. It is also shown that functional equations in this class are overdetermined in the sense of Paneah. This means that the solutions, if they exist, are determined by the corresponding relation being fulfilled not in the original domain of validity, but only at the points of a subset of the boundary of the domain of validity.
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