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.
Moors. The Moors were a nomadic people from North Africa; originally they were the inhabitants of Mauretania. They invaded Spain, taking their Islamic religion and culture with them, in 711, where they overran the Visigoths.