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Hagrid
  • Member for 9 years, 5 months
  • Last seen more than 3 years ago
19 votes
4 answers
11k views

Finding the minimal polynomial of $\sqrt 2 + \sqrt[3] 2$ over $\mathbb Q$.

13 votes
3 answers
2k views

Real polynomial in two variables

  • 1,431
12 votes
3 answers
6k views

Solve $x^3 \equiv 1 \pmod p$ for $x$

12 votes
2 answers
2k views

Is there a discontinuous function on the plane having partial derivatives of all orders?

8 votes
1 answer
2k views

Conjugacy classes in $SU_2$

  • 1,431
7 votes
1 answer
147 views

Separation axioms in uniform spaces

  • 1,273
6 votes
1 answer
491 views

Element of order $2n$ in symmetric group $S_n$

  • 543
6 votes
1 answer
9k views

Conjugacy classes of D2n? [duplicate]

  • 441
5 votes
1 answer
1k views

Uniformly continuous function - modulus of continuity

  • 1,273
5 votes
2 answers
936 views

Compact metric space group $\operatorname{Iso}(X,d)$ is also compact

  • 1,273
5 votes
1 answer
722 views

Prove that there exists a Cauchy sequence, compact metric space, topology of pointwise convergence

  • 543
5 votes
2 answers
2k views

Hausdorff space in which each point has a compact neighbourhood is locally compact

  • 1,273
4 votes
4 answers
544 views

improper integral convergence test

  • 139
4 votes
1 answer
394 views

Normal space- equivalent condition: $\forall U, V$ - open $: U \cup V = X \ \ \ \exists F \subset U \ , G \subset V$ - closed $: F \cup G = X$

  • 1,273
4 votes
1 answer
544 views

Why ternary diagrams work

3 votes
1 answer
137 views

Integral, limit, sequence of functions

  • 1,431
3 votes
1 answer
108 views

Isometries of [0,1] with natural topology

  • 543
3 votes
4 answers
4k views

Questions about the subgroups of $SU(2)$ and relevant problems?

  • 551
3 votes
0 answers
154 views

Combinatorics, equality, $n$-permutations with $k$ cycles

  • 1,273
2 votes
1 answer
319 views

Sequence of continuous functions, integral, series convergence

  • 543
2 votes
1 answer
123 views

Is this another presentation of $D_\infty$?

  • 66.1k
2 votes
2 answers
71 views

Tichonoff theorem, closed subset of $\prod_{t \in T} X_t$

  • 1,273
2 votes
1 answer
980 views

Ring of continuous functions on $\mathbb{R}$, maximal ideal, quotient

  • 1,431
1 vote
1 answer
722 views

Relation between proper map and continuous closed map in metric space

  • 1,615
1 vote
0 answers
584 views

3D graph of a function - its projection onto xy plane?

  • 1,273