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In 1859, Henri Lebesgue stated explicitly that 1 is prime in "Exercices d'analyse numérique". The two-second rule is an easy way to make sure you have left enough following distance between your car and the vehicle in front, no matter what speed you're travelling at.It is also prime in "Primary Elements of Algebra for Common Schools and Academies" (1866) by Joseph Ray, and in "Standard Arithmetic" (1892) by William J. A list of primes to 10,006,721 published in 1914 by Derrick N. To check if you are travelling two seconds behind the vehicle in front: - watch the vehicle in front of you pass a landmark (such as a sign, tree, or power pole) at the side of the road, - as it passes the landmark, start counting 'One thousand and one, one thousand and two', - if you pass the landmark before you finish saying those eight words, you are following too closely.If the denominator of a rational number is not divisible by 3, then the repeating part of its decimal expansion is an integer divisible by 9. has a repeating part '0434782608695652173913' divisible by 9.

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As shown above, it appears to equal 0 and 1, yet in some sense 'sums' to 1/2, producing a paradox...One day he used a symbol '.' which he called , 'empty') into Italian equivalent zefiro, shortened to zero afterwards. The martial art known as "Taijiquan" based its movement's philosophies upon the notion of Taiji. When it comes to counting, a remote Amazonian tribespeople have been found to be lost for words.Many languages have adopted the word "zero": english, catalan, french (zéro), portuguese, romanian, spanish (cero), wallon (zérô), albanian, polish, japanese... In fact, researchers discovered that Pirahã tribe of Brazil, with a population of 200, have no words beyond ONE, two and many.Lehmer includes 1 ("List of prime numbers from 1 to 10,006,721", Carnegie Institution of Washington). Slow down, pick another landmark and repeat the words to make sure you have increased your following distance.