Arctic circle theorem
Encyclopedia
In mathematics, the arctic circle theorem of states that random domino tiling
Domino tiling
A domino tiling of a region in the Euclidean plane is a tessellation of the region by dominos, shapes formed by the union of two unit squares meeting edge-to-edge...

s of a large Aztec diamond
Aztec diamond
In combinatorial mathematics, an Aztec diamond of order n consists of all squares of a square lattice whose centers satisfy |x| + |y| ≤ n...

tend to be frozen outside a certain "arctic circle".
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