"From this proposition it will follow, when arithmetical addition has been defined, that 1 + 1 = 2."

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Works by Bertrand RussellMathematics books
Original Language: English

Sources

✸54·43. In vol. I, part II, "Prolegomena to Cardinal Arithmetic", section A, "Unit Classes and Couples", ✸54, "Cardinal Couples", p. 362