New posts in Formal Power Series

On $A$ algebra homomorphisms $A[[X_1,...,X_n]]\to Q(A)$, where $A$ is a complete DVR

How to show that $\gcd(a_1,a_2,\cdots,a_k) = 1$ implies that there exist a non-negative solution to $\sum_{i=1}^{n}a_ix_i = n$ for large $n.$

Jacobson radical of formal power series over an integral domain

When does $f,g \in R[x]$ relatively prime imply $f,g \in R[[x]]$ relatively prime.

$p$-adic logarithm is a homomorphism, formal power series proof

Is $K[X]\hookrightarrow K[[X]]$ an epimorphism?

Formal Power Series as Linear Operators

A sequence of coefficients of $x+(x+(x+(x+(x+(x+\dots)^6)^5)^4)^3)^2$