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.
Europe. 1  The Dunes of Dyuni, near Pomorie, Bulgaria, vast area of sand dunes in the Burgas Province. 2  The Dune of Pilat, not far from Bordeaux, France, is the largest known sand dune in Europe. 3  The Dunes of Piscinas, in the south west of Sardinia island. 4  Sands of Forvie within the Ythan Estuary complex, Aberdeenshire, Scotland.