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.
Blanket Bogs Blanket bogs are found wherever there is high rainfall, which is typically in western Ireland and also in mountainous areas. They are called blanket bogs because of their appearance-from a distance they appear homogeneous and they hug the topography like a blanket. One of Ireland's most characteristic features is the bog. Covering 1,200,000 hectares (1/6th) of the island, Ireland contains more bog, relatively speaking, than any country in Europe except Finland. Across Europe, as well as in Ireland, bogs have been exploited in recent centuries as a source of fuel.