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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 2969 times.
How to show that $\det(AB) =\det(A) \det(B)$?
Awarded 13 hours ago
Why are norms continuous?
Awarded 2 days ago
How to deal with polynomial quotient rings
Awarded Sep 13 at 12:19
(Why) is topology nonfirstorderizable?
Awarded Sep 10 at 20:30
Proving that a doubly-periodic entire function $f$ is constant.
Awarded Sep 8 at 14:06
Are there infinitely many rational outputs for sin(x) and cos(x)?
Awarded Sep 6 at 21:09
Can a quadrilateral polygon have 3 obtuse angles?
Awarded Sep 6 at 5:56
Expressing the trace of $A^2$ by trace of $A$
Awarded Sep 5 at 2:10
Is it possible to "sort" a continuous function?
Awarded Sep 1 at 22:57
Finding a limit using change of variable- how come it works?
Awarded Sep 1 at 13:12
What's the opposite of a cross product?
Awarded Aug 30 at 8:30
Why is the axiom of choice separated from the other axioms?
Awarded Aug 29 at 17:45
Mathematician vs. Computer: A Game
Awarded Aug 28 at 8:02
Why do we restrict the definition of Lebesgue Integrability?
Awarded Aug 23 at 22:12
Inverse image of a union equals the union of the inverse images
Awarded Aug 23 at 15:09
Prove that $\ell^p$ is complete with respect to the $\|\cdot\|_p$ norm
Awarded Aug 23 at 12:55
Geometric intuition of conjugate function
Awarded Aug 22 at 11:34
Is there an integer that serves as the short leg of a primitive Pythagorean triple, the long leg of another, and the hypotenuse of a third?
Awarded Aug 20 at 22:50
*Recursive* vs. *inductive* definition
Awarded Aug 14 at 16:39
The binomial coefficient $n\choose m$ is divisible by $n/\gcd(n,m)$
Awarded Aug 13 at 14:51
Number of ways of choosing $m$ objects with replacement from $n$ objects
Awarded Aug 12 at 2:19
Equilateral triangle whose vertices are lattice points?
Awarded Aug 11 at 20:41
What is meant by a stopping time?
Awarded Aug 8 at 5:00
Why the term and the concept of quotient group?
Awarded Aug 7 at 18:18
Positive series problem: $\sum\limits_{n\geq1}a_n=+\infty$ implies $\sum_{n\geq1}\frac{a_n}{1+a_n}=+\infty$
Awarded Aug 4 at 19:47
Visualizing quotient groups: $\mathbb{R/Q}$
Awarded Jul 31 at 7:59
Prove $\sum_{n=1}^\infty\frac{\cot(\pi n\sqrt{61})}{n^3}=-\frac{16793\pi^3}{45660\sqrt{61}}$
Awarded Jul 31 at 4:56
Definite integrals solvable using the Feynman Trick
Awarded Jul 30 at 10:34
Haar measure on $\operatorname{SO}(n)$
Awarded Jul 28 at 19:54
Mathematicians' Tensors vs. Physicists' Tensors
Awarded Jul 26 at 21:52
Explain densities to me please!
Awarded Jul 23 at 19:12
Sum of the supremum and supremum of a sum
Awarded Jul 18 at 16:36
Show that $\int_0^ \infty \frac{1}{1+x^n} dx= \frac{ \pi /n}{\sin(\pi /n)}$ , where $n$ is a positive integer.
Awarded Jul 17 at 11:50
the degree of a splitting field of a polynomial
Awarded Jul 14 at 20:50
How many steps are needed to turn one "a" into at least 100,000 "a"s using only the three functions of "select all", "copy" and "paste"?
Awarded Jul 13 at 21:25
why do we use 'non-increasing' instead of decreasing?
Awarded Jul 9 at 10:55
Why is there not a test for diagonalizability of a matrix
Awarded Jul 8 at 7:25
Topologist's sine curve is not path-connected
Awarded Jul 8 at 6:37
Which finite groups are the group of units of some ring?
Awarded Jul 3 at 12:35
Does localization preserve reducedness?
Awarded Jul 2 at 11:50
Matrix multiplication notation
Awarded Jun 29 at 6:40
How to calculate the sine manually, without any rules, calculator or anything else?
Awarded Jun 28 at 10:50
Why use the derivative and not the symmetric derivative?
Awarded Jun 27 at 2:50
How to figure out the log of a number without a calculator?
Awarded Jun 24 at 14:52
Basis of primitive nth Roots in a Cyclotomic Extension?
Awarded Jun 22 at 4:42
Does every proof need an axiom saying it works?
Awarded Jun 21 at 22:27
Are there statements so self-evident that writing a proof for them is meaningless? Is this an example of one?
Awarded Jun 14 at 9:05
How to prove every closed interval in R is compact?
Awarded Jun 11 at 20:41
Why is an open interval not a compact set?
Awarded Jun 11 at 20:17
Dimensions of symmetric and skew-symmetric matrices
Awarded Jun 6 at 8:52
Why are $L^p$-spaces so ubiquitous?
Awarded Jun 5 at 19:36
Where does the word "torsion" in algebra come from?
Awarded Jun 4 at 3:52
Differentiating Definite Integral
Awarded Jun 3 at 23:25
Is sin(x) necessarily irrational where x is rational?
Awarded Jun 1 at 23:09
Is there a continuous bijection from $\mathbb{R}$ to $\mathbb{R}^2$
Awarded Jun 1 at 16:40
Simple proof Euler–Mascheroni $\gamma$ constant
Awarded May 24 at 16:34
What is functional analysis in simple words?
Awarded May 23 at 10:21
Proof that every polynomial of odd degree has one real root
Awarded May 22 at 0:17
basic difference between canonical isomorphism and isomorphims
Awarded May 20 at 22:49
Distance to a closed set is continuous.
Awarded May 18 at 18:55
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