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Publikováno v:
Journal of Applied Mathematics, Vol 2012 (2012)
J. Appl. Math.
J. Appl. Math.
In 1940 and 1964, Ulam proposed the general problem: “When is it true that by changing a little the hypotheses of a theorem one can still assert that the thesis of the theorem remains true or approximately true?”. In 1941, Hyers solved this stabi