Distinct subrings of cardinality $p$ of the field $\mathbb F_{p^2} $
121823
Number of subrings of a Field
142707
Intermediate fields of a finite field extension that is not separable
31451
Proving a subring of $\mathbb{Q}$ containing $\mathbb{Z}$ is a PID
58490
Polynomials, finite fields and cardinality/dimension considerations
144735
Possible cardinality of power sets
9520
Subfields of $\Bbb Q(\zeta_8)$
150064
Cardinality of "$x-y\in\Bbb Q$"-equivalence class of $1/\sqrt2$
156859
Proving that $GF(p^n)$ contains a unique subfield isomorphic to $GF(p^m)$ if and only if $m$ is a divisor of $n$.
149673
Cardinality of an infinite union of finite sets
117005
Rules in the ring with coefficients in finite field $\mathbb{F}_p$
69166
Cardinality of $\mathbb{R}$ and $\mathbb{R}^2$
107821
The ring of integers of $\mathbf{Q}[i]$
36034
Degree of splitting field less than n!
93474
A Finite Boolean Ring is Generated by Finitely Many Copies of $\mathbb{Z} / 2 \mathbb{Z}$
50172
Show that $\mathbb{Q}(\sqrt{2})$ is the smallest subfield of $\mathbb{C}$ that contains $\sqrt{2}$
115541
Subrings of polynomial rings over the complex plane
25290
Determine the number of irreducible monic polynomials of degree 3 in $\mathbb F_p[x]$