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 were a group from North Africa where the Berber people have lived for centuries. At one point they invaded and controlled part of Spain. However when I Google Moors I get pictures like this: Or this: Which do not really match up with the people living in the region now.