Difference (from prior major revision)
(minor diff)
Changed: 10c10
The PowerSet? of any given set S forms a boolean algebra under the partial ordering "is a subset of", where 0={} and 1=S. Any subalgebra of this is called an algebra of sets.
The PowerSet? of any given set S forms a boolean algebra under the partial ordering "is a SubSet of", where 0={} and 1=S. Any subalgebra of this is called an algebra of sets, and in particular, an algebra of sets closed under arbitrary unions is called a TopOlogy.
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