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Fix a small typo in pitfalls page #773

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grunweg merged 2 commits into from
Jan 20, 2026
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Fix a small typo in pitfalls page #773

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Fix a small typo in pitfalls page
pevogam Jan 20, 2026
8d268ca
Update templates/extras/pitfalls.md
pevogam Jan 20, 2026
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2 changes: 1 addition & 1 deletion templates/extras/pitfalls.md
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Expand Up @@ -248,7 +248,7 @@ In mathlib, `Prop` and `Bool` may be assigned different instances for typeclasse

## Not checking for distinctness

Consider the following statement of the pigeonhole principle, which states that if $f : A \to B$ is a function betwen finite sets and $|A| > |B|$, then there exists two distinct elements in $A$ which $f$ map to the same element of $B$:
Consider the following statement of the pigeonhole principle, which states that if $f : A \to B$ is a function between finite sets and $|A| > |B|$, then there exist two distinct elements in $A$ which $f$ maps to the same element of $B$:
```lean
import Mathlib.Data.Fintype.Card

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