To be is to be the value of a variable.
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About Willard Van Orman Quine
Willard Van Orman Quine was a 20th-century American philosopher and logician. Willard Van Orman Quine was an American philosopher and logician in the analytic tradition, recognized as "one of the most influential philosophers of the twentieth century". He was the Edgar Pierce Chair of Philosophy at Harvard University from 1956 to 1978. Read more on Wikipedia →