Szemerédi's theorem
Any of various small passerine birds from the family Sittidae found throughout the Northern hemisphere that have the unusual ability to climb down trees head first.
(mathematics) A result in combinatorics, stating that every set of integers with positive natural density contains a k-term arithmetic progression for every k.
plural of home row
A figure skating jump with a takeoff from a back inside edge and landing on the back outside edge of the opposite foot after one or more rotations in the air.
この組合せ論の定理は、整数の集合が正の自然密度を持つ場合、その集合に任意の長さの等差数列が含まれると述べている。
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