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.
Moorish Ambassador of the Barbary States to the Court of Queen Elizabeth I of England. The Moors were the medieval Muslim inhabitants of al-Andalus (the Iberian Peninsula including present day Spain and Portugal) as well as the Maghreb and western Africa, whose culture is often called Moorish. The word was also used more generally in Europe to refer to anyone of Arab or African descent, sometimes called Blackamoors.