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www.arsmathematica.net
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parametricity.com
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| | | | | There's a famous dubious argument that "proves" the set of $\mathrm{Tree}$ of (planar, rooted) binary trees is in bijection with the set of $7$-tuples of trees $\mathrm{Tree}^6$. | |
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www.mathsisfun.com
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