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# What is the letter or symbol used to represent unknown values?

Updated: 4/28/2022 Wiki User

9y ago

The choice of a token to represent an unknown is wide open. Commonly, x and y are used, but one may use any letter of the alphabet, particularly if it has some phonic association. c is often used as a token for the speed of light; as a substitute for the word celerity. Wiki User

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Q: What is the letter or symbol used to represent unknown values?
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The mathematician David Hilbert used names of colors, such as &quot;white&quot; and &quot;black,&quot; to represent unknown values in his work in mathematics and logic. This approach was part of his concept of &quot;Game Semantics&quot; where colors were used to represent players and moves in mathematical games, allowing for the study of logical systems.

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