"The above proposition [1 + 1 = 2] is occasionally useful."

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Added on April 10, 2026
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Works by Bertrand RussellMathematics books
Original Language: English

Sources

✸110·643. In vol. II, part III, "Cardinal Arithmetic", section B, "Addition, Multiplication and Exponentiation", ✸110, "The arithmetical sum of two classes and of two cardinals", p. 83