New posts in Ideals

Multiplying a ring(or an ideal) by an element.

Why is it that the congruence relations usually correspond to some type of subobject?

Diophantine equation $x^2 + xy − 3y^2 = 17$

Invertibility of elements in $A[x]$ with coefficients in the Jacobson radical

Generators for the ideal of entire functions vanishing on $\mathbb Z\times\mathbb Z\subset \mathbb C\times\mathbb C$

Prove that all ideals in $\mathbb{Z}[x]$ are generated by two elements.

Places of an algebraic number field

Find $n$ such that $J=n\mathbb Z$

Show $\mathbb Z[x]/(x^2-cx) \ncong \mathbb Z \times \mathbb Z$.

Is $\Bbb{Z}$ compact under the evenly spaced integer topology?