Is $K$ here a subfield of $\Bbb C$?
112909
is a number field by definition a subfield of $ \mathbb C $?
58416
Valuations on $\Bbb Q(t)$
114152
Intermediate fields between $\mathbb{Z}_2 (\sqrt{x},\sqrt{y})$ and $\mathbb{Z}_2 (x,y)$
129827
Product of invertibles in $\Bbb Z_n$ [Wilson's Theorem generalization]
98577
Show that the set $\mathbb{Q}(\sqrt{p})=\{a+b\sqrt{p}; a,b,p\in\mathbb{Q},\sqrt{p}\notin \mathbb{Q}\}$ is a field
122110
Character of the subobject classifier in the topos of $\mathbf{M}$-sets.
71102
Subfields of $\mathbb{C}$ which are connected with induced topology
110167
A conjecture with connection to the $abc$-conjecture
22158
Find the quadratic sub field of $\mathbb Q(\zeta_7)$ which can be expressed in the form $\mathbb Q(\sqrt D)$,where $D$ is an integer.
92211
When are $\mathbb Z_m$ and $\mathbb Z_n$ homomorphic?
74663
Is $\mathbb{R}$ an algebraic extension of some proper subfield?
109034
Does a finite $[E:K]_s$ imply that $[E_s:K]$ is finite?
93490
Field that is a subfield of own of its subfields
83009
Showing that $R(x)$ is a proper subset of $R((x))$ if $R$ is a field
36631
Is $[0,1] \cap \Bbb Q$ a compact subset of $\Bbb Q$?
61226
Group Structure on $\Bbb R$
105170
About product of $k$ commutators