New posts in Abstract Algebra

Formal power series with coefficient in $\{0,1 \}$ which is not rational

Classical number theoretic applications of the $p$-adic numbers

Exactness and obstruction in sheaf cohomology

Proving a group is a normal subgroup from its order

Number of possible states on a $6\times 6$ grid

How can a ring of polynomials with coefficients in a field $k$, and in infinitely many variables be a subring of $k[x,y]$?

Is this explanation of normal subgroups and quotient groups correct?

Example of a Ring that has nothing to do with numbers

How to show if $G$ is a finite group and $H$, $K$ normal subgroups of $G$, then $G = HK$ if and only if $G / (H \cap K) \cong G / H \times G / K$?

Why Jacobson radical is 'radical'?