Singmaster's conjecture
(dated) A boy or young man who is employed to serve as an attendant for passengers or crew members on a ship. / (dated) A male flight attendant.
A city in Baden-Württemberg, Germany, on the Neckar, with a famous university; once capital of Würtemberg-Hohenzollern / A district (Landkreis) in central Baden-Württemberg.
(mathematics) A conjecture in combinatorial number theory, stating that there is a finite upper bound on the multiplicities of entries in Pascal's triangle (other than the number 1, which appears infinitely many times).
A knife-edge between components of a conveyor belt system that allows smaller items to be transported
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