%------------------------------------------------------------------------------
% Borel Sets for Hausdorff Spaces
%
% Author: David Lester, Manchester University, NIA, Université Perpignan
%
% All references are to WA Sutherland "Introduction to Metric and
% Topological Spaces", OUP, 1981
%
% Version 1.0 1/5/07 Initial Version
%------------------------------------------------------------------------------
hausdorff_borel[T:TYPE, (IMPORTING topology@topology_def[T])
S:hausdorff]: THEORY
BEGIN
IMPORTING topology@hausdorff_convergence[T,S],
borel[T,S]
x: VAR T
singleton_is_borel: LEMMA borel?(singleton(x))
singleton_is_borel_judge: JUDGEMENT singleton(x) HAS_TYPE borel
END hausdorff_borel
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