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Looking for a proof different from the standard proof(s) of a result

9 votes

Proofs without words

Also elementary, but here is a proof that $C_n = \binom{2n}{n} - \binom{2n}{n+1} = \frac{\binom{2n}{n}}{n+1},$ where $C_n$ is the $n$th Catalan number. http://utdallas.edu/~hagge/images/Catalan.pdf (W …
Martin Sleziak's user avatar