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In 1970, American land-art pioneer Robert Smithson used bulldozers to create an enormous spiral of volcanic rock northeast of the Great Salt Lake, in Utah, in the western United States
Several methods can be used to associate a polygon with a given number.
Once again, we turn to a "spiral"—not in a field or on a canvas, but… inside a watch.
Archimedes is admired for his great discoveries. Less well known is how his proofs unfolded. Without effective mathematical notation, reasoning was fraught with difficulty and demanded considerable ingenuity…
