Item 2 (01EA) — The Clowder Project

Style	Class	Font	Theorem Environments
Style 1	`book`	Alegreya Sans	`tcbthm`
Style 2	`book`	Alegreya Sans	`amsthm`
Style 3	`book`	Arno*	`amsthm`
Style 4	`book`	Computer Modern	`amsthm`

Rings of Formal Power Series. The ring $R[\mspace {-3mu}[t]\mspace {-3mu}]$ of formal power series in a variable $t$ is the inverse limit
\[ R[\mspace {-3mu}[t]\mspace {-3mu}]\cong \operatorname*{{\displaystyle \underset {\longleftarrow }{\operatorname*{\text{lim}}}}}_{n\in \mathbb {N}}\webleft (R\webleft [t\webright ]/t^{n}R\webleft [t\webright ]\webright ); \]

see .

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