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In particular, $\mathbb{N}$ is used to mean either $\{0, 1, \dotsc\}$ or $\{1, 2, \dotsc\}$, depending on the exact area/author. Some write $\mathbf{N}$ for this. It is important for your students to know there are several meanings in use for this particular notation, even if you pick one and stick to it religiously. Personally I stick to the second (most ...


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