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On the sets A + A and A - A
(Wydawnictwo Uniwersytetu Łódzkiego, 1992)
In the paper, an example of a closed set F of real numbers satisfying the conditions F + F = [0, 2] and F - F ≠ [-1, 1] is presented. It is a negative answer to the problem posed by M. Laczkovich. Also, some necessary ...