On the numbers $e^e, e^{e^2}$ and $e^{\pi^2}$.
Résumé
We give two measures of simultaneous approximation by algebraic numbers, the first one for the triple $( e, e^e, e^{e^2})$ and the second one for $(\pi, e, e^{\pi^2})$. We deduce from these measures two transcendence results which had been proved in the early 70's by W. D. Brownawell and the author.
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