Number of Derangements on Finite Set/Historical Note
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Historical Note on Number of Derangements on Finite Set
This problem was first solved by Nicolaus I Bernoulli.
Later, independently, Euler rediscovered the solution.
Sources
- 1971: Allan Clark: Elements of Abstract Algebra ... (previous) ... (next): Chapter $2$: The Symmetric Groups: $\S 78 \alpha$
- 1992: David Wells: Curious and Interesting Puzzles ... (previous) ... (next): The misaddressed letters: $130$