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David Hilbert's proofsproof of the transcendence of $e$ and $\pi$ areis extremely elegant, and totally mysterious.
David Hilbert's proofs of the transcendence of $e$ and $\pi$ are extremely elegant, and totally mysterious.
David Hilbert's proof of the transcendence of $e$ and $\pi$ is extremely elegant, and totally mysterious.
David Hilbert's proof aboutproofs of the transcendence of $e$ and $\pi$ are extremely elegant, and totally mysterious.
David Hilbert's proof about $e$ and $\pi$ are extremely elegant, and totally mysterious.
