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for questions related to the Bourbaki group of mathematicians, its history, philosophy, works and impact

23 votes

Bourbaki's definition of the number 1

This is using the definitions in Bourbaki of cardinal addition $\mathfrak{a}+\mathfrak{b}$ using the disjoint sum of the indexed family $f\colon\mathrm{Card}(2)\to\{\mathfrak{a},\mathfrak{b}\}$ considered …
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