Find all $P\in \mathbb{C}[X]$ such that $P(\mathbb{Q})\subset \mathbb{Q}$
41810
Should all polynomial functions from F to F (F is a field) have coefficients in F?
113892
Show $A \in \cal F$ exists, such that $\mathbb P(A)=1$ and $\mathbb Q(A)=0$.
112205
Which of the following polynomials are subspaces of $\mathbb{P}_n$ for an appropriate value of n?
41035
Mapping that proves $\mathbb{Z} \subset \mathbb{Q}$
125164
How to prove the existence of $b$ in $Q$ such that $a<b^2<c$ in $Q$?
29811
Find all polynomials $P$ such that $P(x^2+1)=P(x)^2+1$
88301
What are all of the connected subsets of $\mathbb{Q}$?
109610
Is $\mathbb{R}[X]/(P)$ isomorphic to $\mathbb C$ for every irreducible polynomial $P$ of degree $2?$
47810
$C(X)$ is separable when $X$ is compact?
77903
Finding the integral closure of $\mathbb{Z}$ in $\mathbb{Q}[i]$
37183
Show that the set of all $x$ such that $x \in P$ and $x \notin Q$ exists
104965
Find $n$ such that polynomial is divisible
145039
Algebraic independence over $\overline{\mathbb Q}$ and over $\mathbb Q$
1962
Polynomial $P(a)=b,P(b)=c,P(c)=a$
127198
What is $\mathbb{C}^{Aut(\mathbb{C}/\mathbb{Q})}$?
18053
Find all prime $p$ such that $x^2=-1$ has a solution in $\mathbb{Z}/p\mathbb{Z}$
46821
Finding roots in $\mathbb{Z}_p$