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.
Far behind the corner of the house--which rose like a geranium bloom against the subdued colours around--stretched the soft azure landscape of The Chase--a truly venerable tract of forest land, one of the few remaining woodlands in England of undoubted primaeval date, wherein Druidical mistletoe was still found on aged oaks, and where enormous yew-trees, not planted by the hand of man grew as they had grown when they were pollarded for bows.