A mental device used to aid memorization. Common mnemonics for mathematical constants such as e and pi consist of sentences in which the number of letters in each word give successive digits.
See also
Arithmetic, e, Josephus Problem, Pi Wordplay, Prime Number, SOHCAHTOA, Trigonometry
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References
Luria, A. R. The Mind of a Mnemonist: A Little Book about a Vast Memory. Cambridge, MA: Harvard University Press, 1987.Weisstein, E. W. "Books about Calculating Prodigies." http://www.ericweisstein.com/encyclopedias/books/CalculatingProdigies.html.
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Cite this as:
Weisstein, Eric W. "Mnemonic." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Mnemonic.html