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.
Hyacinthoides non-scripta is native to the western parts of Atlantic Europe, from north-western Spain (occasionally even north-western Portugal) to the Netherlands and the British Isles. It is found in Belgium, Great Britain, France, Ireland, the Netherlands and Spain, and also occurs as a naturalized species in Germany, Italy and Romania.