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homologically trivial complex

Znám's problem — In number theory, Znám s problem asks which sets of k integers have the property that each integer in the set is a proper divisor of the product of the other integers in the set, plus 1. Znám s problem is named after the Slovak mathematician… … Wikipedia
Sylvester's sequence — In number theory, Sylvester s sequence is a sequence of integers in which each member of the sequence is the product of the previous members, plus one. The first few terms of the sequence are::2, 3, 7, 43, 1807, 3263443, 10650056950807,… … Wikipedia
Suite de Sylvester — Démonstration graphique de la convergence vers 1 de la somme 1/2 + 1/3 + 1/7 + 1/43 +... Chaque rang de n carrés de côté 1/n a une aire totale de 1/n ; l ensemble des rangs recouvre exactement un carré plus grand, d aire 1. [Les carrés de… … Wikipédia en Français
Sucesión de Sylvester — Demostración gráfica de la convergencia de la suma a 1. Cada fila de k cuadrados de lado tiene un área total de , y todos los cuadra … Wikipedia Español
Classification of manifolds — In mathematics, specifically geometry and topology, the classification of manifolds is a basic question, about which much is known, and many open questions remain. Contents 1 Main themes 1.1 Overview 1.2 Different categories and additional… … Wikipedia