List questions from formal-power-series

Published on 25 Mar 2026 - 1:33

104

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Given finite subset of $\mathbb C[[X]]$, does there exist a ring automorphism of $\mathbb C[[X]]$, fixing $A$, but not fixing $\mathbb C[X]$ set wise?

Published on 27 Feb 2018 - 18:13

101

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Given finite subset of $\mathbb C[[X]]$, is there a ring automorphism of $\mathbb C[[X]]$, fixing $A$, but not fixing $\mathbb C$ set wise?

Published on 27 Feb 2018 - 20:32

284

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Is every algebraically closed subfield of $\mathbb C[[X]]$ contained in $\mathbb C$?

Published on 17 Mar 2026 - 12:19

235

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D-finite function?

Published on 25 Mar 2026 - 12:45

189

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To show two formal power series equal

Published on 20 Mar 2026 - 7:36

41

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Can $A[[X]]$ be a finitely generated $A$-algebra?

Published on 12 Mar 2018 - 12:03

190

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Zeros of power series with polynomially bounded integer coefficients

Published on 17 Mar 2018 - 19:24

176

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Which formal power series can be expressed as a rational fraction?

Published on 19 Mar 2018 - 17:28

1.5k

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Power series and partial fractions

Published on 22 Mar 2026 - 0:08

337

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Does $R[[x]] \cong S[[x]]$ imply $R\cong S$

Published on 22 Mar 2026 - 19:31

40

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Can a formal group over Z have different height at different primes?

Published on 31 May 2018 - 4:22

593

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Operations on formal power series in two variables.

Published on 22 Mar 2026 - 14:38

147

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Power rule of exponents for formal power series

Published on 24 Mar 2026 - 16:53

128

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Formal power series: $F_i(x)$ converges if and only if $\lim_{i\to\infty}deg(F_{i+1}(x)- F_i(x))=\infty.$

Published on 21 Jun 2018 - 22:41

List Question

Are $\mathbb C$ , $\mathbb C[X]$ definable in $\mathbb C[[X]]$?

Given finite subset of $\mathbb C[[X]]$, does there exist a ring automorphism of $\mathbb C[[X]]$, fixing $A$, but not fixing $\mathbb C[X]$ set wise?

Given finite subset of $\mathbb C[[X]]$, is there a ring automorphism of $\mathbb C[[X]]$, fixing $A$, but not fixing $\mathbb C$ set wise?

Is every algebraically closed subfield of $\mathbb C[[X]]$ contained in $\mathbb C$?

D-finite function?

To show two formal power series equal

Can $A[[X]]$ be a finitely generated $A$-algebra?

Zeros of power series with polynomially bounded integer coefficients

Which formal power series can be expressed as a rational fraction?

Power series and partial fractions

Does $R[[x]] \cong S[[x]]$ imply $R\cong S$

Can a formal group over Z have different height at different primes?

Operations on formal power series in two variables.

Power rule of exponents for formal power series

Formal power series: $F_i(x)$ converges if and only if $\lim_{i\to\infty}deg(F_{i+1}(x)- F_i(x))=\infty.$

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