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{\bf Sen-Peng Eu and Tung-Shan Fu}
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{\bf A Simple Proof of the Aztec Diamond Theorem}
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Based on a bijection between domino tilings of an Aztec diamond and
non-intersecting lattice paths, a simple proof of the Aztec diamond
theorem is given by means of Hankel determinants of the large and
small Schr\"oder numbers.

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