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Francesco Polizzi
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Are there topological spaces $X,Y$, each having more than $2$ points, such thatsatisfying the following two properties?

  • $X\not\cong Y$, and
  • there is a bijection $\varphi: X\to Y$ such that for all $x\in X$ the spaces $X\setminus \{x\}$ and $Y\setminus \{\varphi(x)\}$ are homeomorphic.

?

Are there topological spaces $X,Y$, each having more than $2$ points, such that

  • $X\not\cong Y$, and
  • there is a bijection $\varphi: X\to Y$ such that for all $x\in X$ the spaces $X\setminus \{x\}$ and $Y\setminus \{\varphi(x)\}$ are homeomorphic

?

Are there topological spaces $X,Y$, each having more than $2$ points, satisfying the following two properties?

  • $X\not\cong Y$, and
  • there is a bijection $\varphi: X\to Y$ such that for all $x\in X$ the spaces $X\setminus \{x\}$ and $Y\setminus \{\varphi(x)\}$ are homeomorphic.
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Non-homeomorphic spaces such that taking away a point makes them homeomorphic

Are there topological spaces $X,Y$, each having more than $2$ points, such that

  • $X\not\cong Y$, and
  • there is a bijection $\varphi: X\to Y$ such that for all $x\in X$ the spaces $X\setminus \{x\}$ and $Y\setminus \{\varphi(x)\}$ are homeomorphic

?