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1h ago
Find $u\in\mathbb{R}$ such that $\mathbb{Q}(u) = \mathbb{Q}(2^{1/2}, 5^{1/3})$.
— geo.ramir3z
132
5h ago
Does $f(x)=x^{2}\sin(\frac{1}{x^{2}})$ satisfy the relation $f(x)+f(y)-2f(\frac{x+y}{2})=O(|x-y|^{2})$?
— Akmal
161
7h ago
Basic question - how to prove that any vector can be uniquely decomposed into parallel and orthogonal parts of any subspace?
— Tim
61
11h ago
How many points can you find on $y=x^2$, for $x \geq 0$, such that each pair of points has rational distance?
— Clark Zinzow
563
14h ago
Let $H$ be a subgroup of a group $G$ such that $x^2 \in H$ , $\forall x\in G$ . Prove that $H$ is a normal subgroup of $G$
— hamidi
411
