Lemma 2.47 . [00IM]

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Lemma 2.47.

Let $\mathcal{T}_{n}(\boldsymbol{r})$ be a $k$ -Tate alegbra. It is strict if and only if $r_{i}\in\sqrt{\lvert k^{\times}\rvert}$ for all $i$ . ([Ber, Corollary 2.1.6])