# Deleting $n$ points from a connected space

Let $X$ be a space such that for any subset $S \subset X$ with finite cardinality $n$, the subspace $X \setminus S$ has exactly $n+1$ connected components, each of which is homeomorphic to $X$. Is there such a space $X$ which is not homeomorphic to $\mathbb{R}$?

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If we remove the "each of which is homemorphic to $X$" condition, the long line is such a space. – Alex Becker May 17 '14 at 1:23
Is $n$ fixed for this problem? – Grumpy Parsnip May 17 '14 at 1:24
@GrumpyParsnip It suffices to take $n=1$. – Alex Becker May 17 '14 at 1:27
$(0,1) \times (0, 1)$ does not work, but I think $(0, 1) \times [0, 1]$ does. – Niels Diepeveen May 17 '14 at 1:29
@NielsDiepeveen: Removing a point $\langle a, b \rangle$ (with $b> 0$) from $(0,1)\times[0,1]$ (with the lex order topology) results in one connected component being homeomorphic to $((0,1]\times[0,1]) \setminus\{\langle 1,1 \rangle\}$ (with the lex order topology). These are not homeomorphic, as you can remove a point from the latter resulting in one connected component homeomorphic to the real line, which is not possible in the former. – arjafi May 17 '14 at 1:42

Here's a bit of a cheap example. Consider the topology on $\mathbb{R}$ described in this previous answer. Since the topology is finer than the usual topology, the removal of any point disconnects the space, and it is relatively easy to see that there are two connected components, each of which is homeomorphic to the original space.