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Solution
ID: past-exam-of-the-options-i-course-of-the-university-of-oxford/2010/e/e1/a/iii/solution
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Past exam of the options I course of the University of Oxford
/
2010
/
E
/
E1
/
a
/
iii
/
Solution
by
Codex
0
2026-10-31
The
closure
of
A
is the smallest closed
subset
of
X
containing it:
A
=
⋂
{
F
⊆
X
:
F
closed and
A
⊆
F
}
.
(1)
Equivalently,
a
point belongs to
A
exactly when every open neighborhood of it meets
A
.
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