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Mathematics

Self-Learner

 Self-Learner
Answer your own question with score of 3 or more.
Awarded 4675 times.
Is there a name for this kind of subgroup?
Awarded 11 hours ago
what is a closure (hull) operator?
Awarded 17 hours ago
Is the map $\Phi: E \otimes_F E \to E^m$ always surjective?
Awarded Apr 28 at 6:10
General form (or parametrizations) of symmetric $3 \times 3$ matrices with repeated eigenvalues
Awarded Apr 23 at 4:46
Monotone convergence theorem of random variables and its example
Awarded Apr 21 at 14:56
Critic Loss in PPO
Awarded Apr 16 at 21:16
Can a holomorphic function "leak" to a larger space?
Awarded Apr 15 at 15:08
Solving $y^3=x^3+8x^2-6x+8$
Awarded Apr 15 at 1:55
Side of the small pentagon formed by diagonals of a regular pentagon
Awarded Apr 14 at 16:48
Proof of the "Maz identity" for solving integrals
Awarded Apr 12 at 22:18
Is there parametric solution for $a^4+a^2b^2+b^4=c^4+c^2d^2+d^4$ having a polynomial form of degree six or less?
Awarded Apr 6 at 0:07
Question about the Spectrum of a Matrix whose Entries contain Binomial Coefficients
Awarded Apr 5 at 11:49
Transitivity Property of Separable Extensions
Awarded Apr 4 at 11:40
Other proofs of inequality $\frac{a}{3a-b+c}+\frac{b}{3b-c+a}+\frac{c}{3c-a+b} \ge 1$
Awarded Apr 3 at 23:46
The magnetic field of a spinning charged sphere
Awarded Apr 2 at 23:12
Finite universal covering induces injective maps on cohomology
Awarded Apr 2 at 4:33
Alternative proof of the Riesz Representation Theorem
Awarded Apr 1 at 7:55
Why does this work? Applying residue theorem to some functions with non-integer powers in the denominator. Surprisingly it yielded the correct result
Awarded Mar 30 at 20:27
Can an infinitely prime divisible element exist in a finitely generated abelian-by-nilpotent group?
Awarded Mar 30 at 19:08
Can the Stolz-Cesàro theorem be used to prove L'Hospital's rule, or viceversa?
Awarded Mar 29 at 1:36
Prove that $\tan^{-1}(x) = -\tan^{-1}(-x)$
Awarded Mar 28 at 1:17
Is this a valid proof of $x\cup x=x$ and also is this the standard way to write proofs of this type?
Awarded Mar 16 at 18:01
Convergence of Legendre Expansion in the Mean-Square sense.
Awarded Mar 15 at 11:17
Derivation into dense ideal of Banach algebras
Awarded Mar 11 at 9:11
Do any of the Arkhangel'skii $\alpha_i$ properties hold for $\mathbb{R}$ extended by a point with co-countable open neighborhoods?
Awarded Mar 8 at 6:27
Question about the construction of Mukai flop
Awarded Mar 4 at 10:50
How do I find the homeomorphism that flattens this knot?
Awarded Mar 3 at 8:49
Why drawing-generally-first beats targeted-first in drawing a desired card?
Awarded Mar 2 at 0:02
Is rank of fundamental group bounded below by number of boundary surfaces, in dimension 3?
Awarded Feb 27 at 13:16
Group with proper subgroups infinite cyclic
Awarded Feb 26 at 10:25
Special partition of the set $[n]$
Awarded Feb 26 at 1:49
What is a good book on general octonion algebras and the Cayley-Dickson construction?
Awarded Feb 24 at 15:12
What is the best algorithm for finding Goldbug Numbers?
Awarded Feb 23 at 16:47
Formula for the interior product of a p-form
Awarded Feb 19 at 13:52
Show particular point topology, is a topology
Awarded Feb 19 at 4:21
evaluating $ I = \int_{0}^{\infty} \frac{x^5 (e^{3x} - e^x)}{(e^x - 1)^4} dx $
Awarded Feb 18 at 16:47
Show that $\sum_{n \leq x} \left( \frac{\phi(n)}{n} \right)^\kappa = c(\kappa)x + O(x^\epsilon)$.
Awarded Feb 18 at 13:57
Finding an English translation to Kazimierz Kuratowski's finiteness paper.
Awarded Feb 18 at 9:34
In the family of circles tangent to two intersecting circles, each pair generates 3 straight lines : prove that they concur on the radical axis
Awarded Feb 16 at 3:11
Finding $\tan\theta$ if $\sin^2\theta + x^2 + x\sqrt3 \sin\theta = 3$ and $\cos^2\theta + x^2 + x \cos \theta = 4$
Awarded Feb 15 at 21:53
If $HK = KH$ and $H \cap K$ is normal in $H$, is $K$ normal in $HK$?
Awarded Feb 7 at 5:37
Can induction and coinduction be generalized into a single principle?
Awarded Feb 5 at 19:37
Can distinct field extensions $i: k \to F$ and $j: k \to F$ yield nonisomorphic automorphism groups?
Awarded Feb 1 at 15:17
Did Gosper or the Borweins first prove Ramanujans formula?
Awarded Jan 31 at 9:31
Every short game equal to a surreal number, is in fact equal to a dyadic rational.
Awarded Jan 29 at 12:01
Do the Arkhangel'skii $\alpha_i$ properties hold for order topologies?
Awarded Jan 29 at 9:49
What is $\lim_{n\to\infty}\int_0^{2026}\underbrace{\log_{\sqrt{2}}(x+\log_{\sqrt{2}}(x+\cdots\log_{\sqrt{2}}(x+2026)\cdots))}_{n\mathrm{~logs}}dx$?
Awarded Jan 27 at 15:01
An efficient code-free graph drawing software for generating high-order complex graphs.
Awarded Jan 26 at 19:48
The maximum of $xy \sin \alpha + yz \sin \beta +zx \sin \gamma$
Awarded Jan 24 at 5:02
How to prove that this triangle is equilateral?
Awarded Jan 23 at 13:26
(post deleted or otherwise unavailable)
Awarded Jan 19 at 23:34
Reference request: Laplace-Beltrami eigenfunction bases for Sobolev spaces
Awarded Jan 19 at 11:06
(post deleted or otherwise unavailable)
Awarded Jan 17 at 17:57
Orders of all the elements in polynomial quotient ring
Awarded Jan 16 at 1:42
Proof of a particular piece of Milnor-Wolf theorem
Awarded Jan 15 at 17:17
Does extending all segments in a plane region by a constant factor increase the area by at most a constant factor?
Awarded Jan 15 at 10:03
Compute Power Series Convergence to a function
Awarded Jan 13 at 15:42
Isosceles trapezoid and rhombus from angle bisectors in a square
Awarded Jan 7 at 21:19
For which $n$ does the $n$th cyclotomic polynomial always take values congruent to $1 \pmod{n}$?
Awarded Jan 7 at 16:47
Solving the beautiful functional equation $ f\left(x^3+xf(xy)\right) = f(xy)+x^2f(x+y) $
Awarded Jan 4 at 21:32
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