User:Torben

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Interessante Bücher und Filme

Don't Drink and Derive

<math> \begin{align} a & = b \\ a^2 & = ab \\ 2a^2 & = a^2 + ab \\ 2a^2 -2ab & = a^2 - ab \\ 2a(a-b) & = a(a-b) \\ 2a & = a \\ 2 & = 1 \end{align} </math>