Dense Set
In
topology
and related areas of
mathematics
a
subset
of a
topological space
is called
dense
if the only
closed subset
of
X
containing
A
is
X
itself. This can also be expressed by saying that the
closure
of
A
is
X
. Equivalently, every nonempty
open subset
of
X
intersects
A
, or in other words: the
interior
of the complement of
A
is empty.
Examples
every topological space is dense in itself
the
real numbers
with the usual topology have the
rational numbers
and the
irrational numbers
as dense subsets
a metric space space
M
is dense in its
completion
\gamma M
See also
separable space
, a space with a
countable
dense subset
nowhere dense set
the opposite notion
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