# ProofWiki:Jokes/Coffee and Doughnuts

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## Joke

A topologist is a mathematician who can't tell his doughnut from his coffee mug.

## Sources

- 1975: W.A. Sutherland:
*Introduction to Metric and Topological Spaces*... (previous) ... (next): $3$: Continuity generalized: topological spaces: $3.6$: Homeomorphisms: Examples $3.6.2 \ \text{(e)}$