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Space
S000164
Sum of singleton and two-point indiscrete space
The space
X
=
{
a
,
b
,
c
}
X=\{a,b,c\}
X
=
{
a
,
b
,
c
}
with the topology
{
∅
,
{
a
,
b
}
,
{
c
}
,
X
}
\{\emptyset,\{a,b\},\{c\},X\}
{
∅
,
{
a
,
b
}
,
{
c
}
,
X
}
, that is, the topological sum of
The Singleton
and
Indiscrete Topology on a Two-Point Set
.
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