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Mathematics, 09.01.2020 00:31 falconsfan20182

Let (x,)
be a topological space. a nonempty collection sof open subsets of x
is called a subbasis for
if the collection of all finiteintersections of members of s forms
a basis for
.
let x be a nonempty set and s the collection of all subsets x \
{x}for

prove s is a subbasis for the finite- closed topology on x.

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Let (x,)
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is called a...
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