# 3 in 1: A simple way to prove that $e^r$, ln($r$) and $\pi^2$ are irrational

### Jürgen Müller

Universität Trier, Germany### Tom Müller

Universität Trier, Germany

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## Cite this article

Jürgen Müller, Tom Müller, 3 in 1: A simple way to prove that $e^r$, ln($r$) and $\pi^2$ are irrational. Elem. Math. 73 (2018), no. 3, pp. 133–135

DOI 10.4171/EM/363