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.
Chamaerops humilis is native to the hot dry hills and mountains of the Mediterranean Sea basin. Its native range extends from Africa's Atlas Mountains in Morocco to Spain and France and eastward to Turkey. The European fan palm forms clumps than can grow up to 15 ft (4.5 m) in height.