"It must be remembered, that small quantities if they occur in our expressions as factors multiplied by some other factor, may become important if the other factor is itself large. Even a farthing becomes important if only it is multiplied by a few hundred."
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Calculus Made Easy
Calculus Made Easy: being a Very Simplest Introduction to those Beautiful Methods of Reckoning which are Generally Called by the Terrifying Names of the Differential Calculus and the Integral Calculus, by Silvanus Phillips Thompson, was first published in 1910, and is considered a classic and elegant introduction to the subject. A 1998 update by Martin Gardner provides notes for modern readers and provides current versions of many obsolescent mathematical notations or terms. The following quotes
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