Are $e$ and $\pi$ algebraically independent?
Is $e + \pi$ irrational?
Is $e \pi$ irrational?
Is $e ^ e$ irrational?
Is $\pi ^ e$ irrational?
Is $\pi ^ \pi$ irrational?
Is $\ln(\pi)$ irrational?
Is the Euler-Mascheroni constant $\gamma$ irrational?
Is the Catalan constant $$G = \sum_{n=0}^∞ (-1)^n / (2n + 1)^2 \approx 0.91596$$ irrational?