Knot Theory
If the two loose ends of an overhand knot are joined together (without creating additional crossings), this becomes equivalent to the trefoil knot of mathematical knot theory.
Read more about this topic: Overhand Knot
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“Not the less does nature continue to fill the heart of youth with suggestions of his enthusiasm, and there are now men,—if indeed I can speak in the plural number,—more exactly, I will say, I have just been conversing with one man, to whom no weight of adverse experience will make it for a moment appear impossible, that thousands of human beings might exercise towards each other the grandest and simplest of sentiments, as well as a knot of friends, or a pair of lovers.”
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