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.
From this root, the name moor is applied to unbaptized children, meaning not Christian. In Basque, mairu means moor and also refers to a mythical people. Within the context of Portuguese colonization, in Sri Lanka (Portuguese Ceylon), Muslims of Arab origin are called Ceylon Moors, not to be confused with Indian Moors of Sri Lanka (see Sri Lankan Moors).