Szemerédi's theorem
(mathematics) A result in combinatorics, stating that every set of integers with positive natural density contains a k-term arithmetic progression for every k.
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.
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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