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The family
of Borel sets of a space
is the
smallest family satisfying the conditions:
(i) Every closed set belongs to
;
(ii) If
is in
, then
is in
;
(iii) The countable intersection of elements of
belongs
to
.
Next: branch point
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Previous: bihomogeneous
Janusz J. Charatonik, Pawel Krupski and Pavel Pyrih
2001-11-30