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.
âThe heather on the moors was in full bloom and although there was an autumnal edge to the air the day was almost perfect.â âTonight again snow falls on the mountains and moors.â âThe open moors and heaths were another source for other varieties of plants, especially berries, as well as providing areas for sheep and goat grazing.â âThis is fabulous walking country, a land of far horizons and rare tranquillity with vast areas of rounded hills and heather moors.â