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Mathematics

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Accepted answer and score of 40 or more. This badge can be awarded multiple times.
Awarded 3077 times.
Uncountable closed set of irrational numbers
Awarded 21 hours ago
Baby Rudin vs. Abbott
Awarded yesterday
coincidental (?) patterns in logs of repeating decimals, e.g. $\ln(2/3)$ vs. $\ln(0.6666666)$
Awarded May 5 at 20:11
difference between linear, semilinear and quasilinear PDE's
Awarded May 4 at 2:31
What does it mean to be "affinely independent", and why is it important to learn?
Awarded May 3 at 8:55
What is the difference between mutually independent and pairwise independent events in probability theory?
Awarded May 1 at 9:43
Group abelianization
Awarded Apr 28 at 16:08
Yoneda-Lemma as generalization of Cayley`s theorem?
Awarded Apr 24 at 12:50
Hilbert polynomial of an hypersurface in projective space
Awarded Apr 23 at 20:32
An element of a group $G$ is not conjugate to its inverse if $\lvert G\rvert$ is odd
Awarded Apr 23 at 1:22
Are there non-zero real numbers equal to their "average decimal digit"?
Awarded Apr 22 at 18:34
Is an infinite composition of bijections always a bijection?
Awarded Apr 22 at 1:38
What explains this peak probability "gain" in the birthday problem?
Awarded Apr 21 at 14:17
What is a Tensor Product?
Awarded Apr 21 at 13:32
Examples of morphisms of schemes to keep in mind?
Awarded Apr 21 at 5:56
If $2^n+1$ is prime, why must $n$ be a power of $2$?
Awarded Apr 6 at 3:54
Why is the localization of a commutative Noetherian ring still Noetherian?
Awarded Apr 5 at 6:14
"Negative" versus "Minus" when referring to Real numbers
Awarded Mar 25 at 23:23
Intuition for random variable being $\sigma$-algebra measurable?
Awarded Mar 22 at 11:05
Expected number of tosses to get 3 consecutive Heads
Awarded Mar 21 at 14:51
Find the number of arrangements of $k \mbox{ }1'$s, $k \mbox{ }2'$s, $\cdots, k \mbox{ }n'$s - total $kn$ cards.
Awarded Mar 15 at 5:21
The set of ultrafilters on an infinite set is uncountable
Awarded Mar 13 at 15:02
How likely are you to win this multi-stage lottery?
Awarded Mar 7 at 4:16
Is $(k \cdot f)(x) := f(kx)$ the scalar multiplication of some vector space?
Awarded Mar 5 at 6:34
When does equality hold in the Minkowski's inequality $\|f+g\|_p\leq\|f\|_p+\|g\|_p$?
Awarded Mar 5 at 0:21
how to prove the chain rule?
Awarded Mar 3 at 12:06
Hexagons are best for tiling 2D space in terms of perimeter vs area. What's best for 3D space?
Awarded Mar 2 at 10:17
Applications of Pseudodifferential Operators
Awarded Mar 1 at 2:37
Lebesgue integral of a positive function on a set of positive measure
Awarded Mar 1 at 1:59
What is a Dynkin system? ($\lambda$-system)
Awarded Feb 26 at 6:07
mod [= remainder] operation (and relation), name and meaning
Awarded Feb 21 at 21:33
Why do all elementary functions have an elementary derivative?
Awarded Feb 21 at 14:45
Are these figures homeomorphic?
Awarded Feb 20 at 0:18
How to check if a set of vectors is a basis
Awarded Feb 12 at 23:56
Determinant of the Kronecker Product of Two Matrices
Awarded Feb 11 at 8:48
Existence of irreducible polynomials over finite field
Awarded Feb 9 at 7:53
The sum of the squares is less than or equal to the square of the sums for all $n$
Awarded Feb 8 at 15:15
Why can't the quadratic formula be simplified to $x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}=\frac{-b\pm(b-2)\sqrt{ac}}{2a}$?
Awarded Feb 8 at 8:31
Prove: If a sequence converges, then every subsequence converges to the same limit.
Awarded Feb 8 at 3:33
Real life examples for eigenvalues / eigenvectors
Awarded Feb 4 at 0:51
Integral $\int_0^1\frac{\arctan^2x}{\sqrt{1-x^2}}\mathrm dx$
Awarded Feb 1 at 19:14
Why do differential forms have a much richer structure than vector fields?
Awarded Jan 30 at 20:03
Knowing that for any set of real numbers $x,y,z$, such that $x+y+z = 1$ the inequality $x^2+y^2+z^2 \ge \frac{1}{3}$ holds.
Awarded Jan 27 at 7:57
$A=\pmatrix{1&2&3&4&5\\2&3&4&5&6}.$ Find $\det(A^TA)$.
Awarded Jan 27 at 1:34
Does the series $ \sum_{n=1}^{\infty}\left( 1-\cos\big(\frac{1}{n} \big) \right)$ converge?
Awarded Jan 25 at 22:41
Moment generating functions/ Characteristic functions of $X,Y$ factor implies $X,Y$ independent.
Awarded Jan 23 at 23:39
Why can't you prove the law of the excluded middle in intuitionistic logic (for layman)?
Awarded Jan 21 at 23:27
Proof that every finite dimensional normed vector space is complete
Awarded Jan 17 at 1:10
Sum of odd numbers can never equal their least common multiple
Awarded Jan 16 at 20:06
Expectation of the maximum of gaussian random variables
Awarded Jan 16 at 13:35
Why left continuity does not hold in general for cumulative distribution functions?
Awarded Jan 13 at 15:42
Is there a $f: \mathbb{N} \to \mathbb{N}$ such that $\sum_{n=1}^{\infty} \frac{1}{n^2f(n)} \in \mathbb{Q}$?
Awarded Jan 11 at 16:48
What is the purpose of Jordan Canonical Form?
Awarded Jan 11 at 13:32
Homology of the Klein Bottle
Awarded Jan 8 at 20:18
Applications of rings without identity
Awarded Jan 7 at 23:25
Why does drawing $\square$ mean the end of a proof?
Awarded Jan 6 at 21:12
Can the Bourbaki series be used profitably by undergraduates?
Awarded Jan 6 at 0:30
Example of a finitely generated module with submodules that are not finitely generated
Awarded Jan 4 at 21:01
How do you calculate a sum over a polynomial?
Awarded Jan 3 at 1:12
Why is the multiplicative group of a finite field cyclic?
Awarded Dec 29, 2024 at 20:33
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