Arno Trautmann wrote:
> \def\doubleN
> \catcode`\ℕ=\active
> \letℕ\doubleN

Sry, muss natürlich heißen:
\def\doubleN{\ensuremath{\mathbb{N}}}
\catcode`\ℕ=\active
\letℕ\doubleN

Gruſs
Arno

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