“The multiplication table will not occur in this book, not even the theorem,2 \cdot 2 = 4,but I would recommend, as an exercise, that you define2 = 1 + 1,
4 = (((1 + 1) + 1) + 1)and then prove the theorem.”

Grundlagen der Analysis [Foundations of Analysis] (1930) Preface for the Student, as quoted by Eli Maor, Trigonometric Delights (2013)

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Do you have more details about the quote "The multiplication table will not occur in this book, not even the theorem,2 \cdot 2 = 4,but I would recommend, as an e…" by Edmund Landau?
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Edmund Landau 7
German Jewish mathematician 1877–1938

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