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Request in title. Could we have site-wide predefined $\LaTeX$ macros \N, \Z, \Q and \R for $\mathbb{N}$, $\mathbb{Z}$, $\mathbb{Q}$, and $\mathbb{R}$, respectively? Any short variant would also do, like \NN, or \bN, or what have you.

I think that dozens of thousands of keystrokes would be saved by this.

Is it that there are such macros and I didn't figure them out?

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