"The numbers 1, 1+1=2, 2+1=3, etc. are said to be natural; it is assumed that none of these numbers is zero".
Why do we have/need such an assumption?

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Because it makes that \(\forall A,B\in\mathbb N, \frac AB\in\mathbb N\).
@ikram002p am I right?

We can also have A = 1, B = 3, but 1/3 \(\notin \mathbb N\)?

then i'm not right lol

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