The use of knots may predate mode humans (Homo sapiens). For example, seashells colored with ocher, pierced with holes, and dated to 82,000 years ago have been discovered in a Moroccan cave. Other archeological evidence suggests much older bead use in humans. The piercing implies the use of cords and the use of a knot to hold the objects to a loop, such as a necklace. The quintessence of oamental knots is exemplified by The Book of Kells, an oately illustrated Gospel Bible, produced by Celtic monks in about A.D. 800. In mode times, the study of knots, such as the trefoil knot with three crossings, is part of a vast branch of mathematics dealing with closed twisted loops. In 1914, German mathematician Max Dehn (1878-1952) showed that the trefoil knot's mirror images are not equivalent. For centuries, mathematicians have tried to develop ways to distinguish tangles that look like knots (called unknots) from true knots and to distinguish true knots from one another. Over the years, mathematicians have created seemingly endless tables of distinct knots. So far, more than 1.7 million nonequivalent knots with pictures containing 16 or fewer crossings have been identified. Entire conferences are devoted to knots today. Scientists study knots in fields ranging from molecular genetics-to help us understand how to unravel a loop of DNA-to particle physics, in an attempt to represent the fundamental nature of elementary particles. Knots have been crucial to the development of ci آنها نمیخواستند وجود داشته باشند، ولی نمیتوانستند جلویش را هم بگیرند. فقط همین....
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برچسب : نویسنده : hamedhakemi بازدید : 72 تاريخ : شنبه 4 تير 1401 ساعت: 21:49