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∗ The first and third author were partially supported by National Fund for Scientific Research at the Bulgarian Ministry of Science and Education under grant MM-701/97.
A theorem proved by Fort in 1951 says that an upper or lower
semi-continuous set-valued mapping from a Baire space A into non-empty
compact subsets of a metric space is both lower and upper semi-continuous
at the points of a dense Gδ -subset of A.
In this paper we show that the conclusion of Fort’s theorem holds under
...
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