Schubert (1949) showed that every knot can be uniquely decomposed (up to the order in which the decomposition is performed) as a knot sum of a class of knots known as prime knots, which cannot themselves be further decomposed (Livingston 1993, p. 5; Adams 1994, pp.
The Moors were Muslim inhabitants of the Maghreb, the Iberian Peninsula, Sicily, and Malta during the Middle Ages.
The Moors arrived in 711. On January 2, 1492 the last Moors were defeated militarily and surrendered the Alhambra in Granada. Later in the same year they were forced to conver â¦ t to Christianity or leave Iberia. I specifically did not say Spain because Spain did not exist at that time.