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Score of 2
0 answers
23 views

Prove $\sin\angle A_iD_kA_j \propto D_kD_l\cdot D_iD_j$ for insphere contact points in a tetrahedron

Score of 1
1 answer
48 views

Subdifferential of supremum functions (Limiting sense)

Score of 0
1 answer
57 views

Decidability of palindrome problem

Score of 2
1 answer
222 views

Intuition behind substitution $x=\sqrt{\frac{a-t}{b+t}}$

Score of 1
1 answer
675 views

Inverse Kendall's Tau

Score of 18
6 answers
822 views

Geometrically, why is $\pi < \sqrt{10}?$

Score of 3
2 answers
705 views

Computing inverses $\!\bmod n^k\,$ by Hensel lifting or Newton's method

Score of 8
8 answers
2625 views

Counterexample: functor does not preserve monomorphisms

Score of 2
1 answer
143 views

Construction of 2-category of monoidal categories and (lax) monoidal functors as strict algebra category of a 2-monad

Score of 38
6 answers
48335 views

Difference between "for any" and "for all"?

Score of 1
0 answers
18 views

On the classification of (nondegenerate) bilinear forms over $\mathbb{F}_2$

Score of 2
1 answer
57 views

On uniqueness of the coordinate morphism given a projective basis

Score of -1
0 answers
27 views

What arrangement of the fence maximizes the yard area?

Score of -1
1 answer
6073 views

Legendre Symbol (2/p)

Score of 4
1 answer
2384 views

Compute primitive $ \int_0^1{ \sin(x) \sqrt{ 1-x^2 } } dx$

Score of 3
1 answer
221 views

A constant ratio between the summation of an alternating series and integration of the general term function.

Score of 1
1 answer
61 views

Why is equality included as a relation in $\mathsf{ZF}$ (and perhaps other) set theories?

Score of 2
4 answers
187 views

Prove isosceles right triangle $\triangle PNQ$ with angle chasing

Score of 1
1 answer
570 views

Universal Injectivity of Morphisms of Finite Type $k$-Scheme can be checked on the level of sets at closed points

Score of 5
6 answers
57845 views

How to integrate $\int \sqrt{x^2+a^2}dx$

Score of 16
2 answers
1723 views

Is it true that $\cos4x=\lim _{n\to\infty}\sum_{k=0}^{2n}\sum_{j=0}^k(-1)^{k+j}\binom{4n}{2k}\binom{k}{j}\left(\frac{x^{2}}{n^{2}}\right)^{2n-k+j}$?

Score of 0
0 answers
27 views

Encoding coefficients in proofs?

Score of 4
1 answer
2604 views

Weierstrass Substitution

Score of 4
1 answer
219 views

Closed - form for $I=\int\limits_0^\infty {\frac{{\ln \left( {f\left( t \right)} \right)}}{{\left( {{t^2} + 1} \right)\sqrt {{t^2}+1+{x^2}} }}dt} $

Score of 10
2 answers
2854 views

To show a morphism of affine k-varieties which is surjective on closed points is surjective

Score of 3
1 answer
670 views

Finding the probability of selecting a certain ball on the $j$th draw from $M$ balls with $W$ white balls

Score of 2
2 answers
204 views

Is there a precise definition to "interpretation" in Mathematics?

Score of 0
2 answers
329 views

Surface area given a function in polar without converting to rectangular

Score of 0
0 answers
11 views

On a partizan variant of Moore's k-Nim

Score of 1
2 answers
64 views

2nd order homogenous linear ordinary differential equation, finding a second solution given an existing solution,Wronskian.

Score of 5
1 answer
557 views

A tough log-sine integral $I=\int_{0}^{\frac{\pi}{2}}x\sqrt{\tan(x)}\cdot \ln(\sin(x))\mathrm{d}x$

Score of 1
3 answers
455 views

Integrate $\int \frac{\sqrt{\sin x}}{\sqrt{\sin x} + \sqrt{\cos x}}dx$

Score of 6
2 answers
158 views

Relationship between crossed-homomorphisms and distributivity in a ring, with an application to Integration by substitution

Score of 0
1 answer
596 views

Calculating angle to aim at target results in over/under aim depending on whether target is below/above

Score of 1
1 answer
703 views

Computational Complexity of Newton's Method

Score of 6
2 answers
132 views

Computing the recursive function $f(x) = -x$ for $x<0$, and $f(x)=\frac12 f(x-f(x-1))$ for $x\ge 0$

Score of 3
3 answers
260 views

How can we prove that the successor function on natural numbers never loops back?

Score of 7
2 answers
254 views

Proving that an isosceles right triangle cannot be dissected into three congruent polygons

Score of 0
1 answer
557 views

Find intersection of two semi-circles

Score of 1
1 answer
36 views

What should be the operator norm $m(L)$ where $L$ is selfadjoint operator on $L^2$

Score of 4
1 answer
87 views

Does the Prime Number Theorem imply the asymptotic $\sum_p p e^{-εp} \sim \frac1{ε^2\log(1/ε)}$?

Score of 20
6 answers
1278 views

Improper Integral $\int\limits_0^{0.5}(2x - 1)^6\log^2(2\sin\pi x)dx$

Score of 1
0 answers
23 views

Stationary phase approximation for Hankel transform

Score of 0
1 answer
553 views

Help with proof - Total boundedness implies existence of a Cauchy subsequence for every sequence

Score of 1
1 answer
79 views

Equivalence of "sum" and "max" norms in linear spaces of functions

Score of 11
1 answer
489 views

How many different definitions of tangent space are there?

Score of 6
2 answers
168 views
+50

Is this the only sum of three perfect powers that survives the swap of bases and exponents?

Score of -3
0 answers
173 views

Why does iterating $a(b,n)$ and highlighting loops produce these patterns?

Score of 0
1 answer
41 views

Dihedral vs. polyhedral symmetry

Score of 10
1 answer
260 views

Checking my solution to $2^x (2+\sqrt{3})^x - 2(1+\sqrt{3})^x = 2$

Score of 4
2 answers
463 views

Notation: May the outer parentheses be omitted in $((X_i,\tau_i))_{i\in I}$?

Score of 0
1 answer
685 views

How to calculate UMVUE of $\mu,\sigma$ in a two-parameter exponential distribution?

Score of 18
2 answers
1324 views

How to relate $\int_0^\pi\tan^{-1}\left(1+\cos x\right)dx$ to Cleo's integral without evaluating it?

Score of 10
6 answers
37624 views

What can we say about $\int_{0}^{a} x!\,{\rm d}x$?

Score of 0
0 answers
34 views

Multiplying the four Ptolemy branches gives the square of the circle equation up to a constant factor

Score of 3
1 answer
55 views

What is the group of "Cayley-produced" permutations?

Score of 14
1 answer
486 views

Strong upper bound for consecutive p-smooth numbers

Score of 17
1 answer
1815 views

Why am I finding the Catalan numbers in these "Snowball Numbers"?

Score of 1
1 answer
154 views

Bell like distribution in 3D periodic probability function

Score of 0
0 answers
20 views

Simplicial boundaries and horns as colimits

Score of 1
1 answer
109 views

What Laplace transformation is used for this?

Score of 0
1 answer
577 views

Abel Summation Formula

Score of 5
0 answers
98 views

Hausdorff assumption in long exact sequence of Cech cohomology

Score of 9
1 answer
587 views

$\mathrm{Ext}^1( \mathbb{Q},B)$ for torsion-free group $B$

Score of 5
1 answer
104 views

Can a 3-ball deformation retract to a knotted arc in its interior?

Score of 6
4 answers
770 views

Characterization of ordered ring $\mathbb{Z}$ via well-ordering of positives.

Score of 2
1 answer
71 views

Clarifying Confusion with Hecke Operators and Double Cosets

Score of 0
1 answer
566 views

Solving integral for Cauchy distribution density function

Score of 2
0 answers
686 views

Length bound for a ray lift-off from a critical point of a polynomial

Score of 0
0 answers
31 views

Levy flight foraging hypothesis...or not?

Score of 3
1 answer
103 views

Decomposing a 3x3 linear transformation matrix into rotation, scale & reflection, and shear

Score of 0
1 answer
198 views

The Girsanov theorem proof

Score of 1
1 answer
81 views

Strong uniquness of $\mathrm dX_t = \operatorname{sign}(X_t) \sqrt{|X_t|} dt+ \mathrm d W_t$, $X_0 =0$ in 1D

Score of 4
1 answer
140 views

Is the curve $y^2=x^4+1$ elliptic?

Score of 8
2 answers
3362 views

Find the area of the part of the paraboloid $z = x^2 + y^2$ that lies under the plane $z=4-x$

Score of 6
1 answer
146 views

Looking for a (pathological) functor preserving initial objects and binary coproducts, but not all finite coproducts

Score of 0
0 answers
32 views

When the induced arithmetic of an embbeded Peano system in a ordered integral domain coincide with the arithmetic of the domain?

Score of 0
1 answer
590 views

Is the unit sphere in $\mathbb{R}^n$ a zero-content set?

Score of 11
2 answers
555 views

$V$ Euclidean iff there exist linear isometry that $f(v)=w$ for $|v|=|w|$

Score of 0
0 answers
40 views

Evans PDE (2nd ed) chapter 7 problem 9: Is my simple solution incorrect?

Score of 3
3 answers
172 views

Simplifiying the trigonometry equation to show that triangle is isosceles

Score of 2
1 answer
102 views

Sufficient conditions for PSD matrix completion

Score of 6
1 answer
100 views

Deriving a closed form for a Fermi-Dirac integral

Score of 2
0 answers
173 views

A Combinatorics Problem about Completing Pokemon Pokedex via Trading

Score of 4
1 answer
43 views

Tighter upper bound for the maximum inner product of random (-1,1)-matrices

Score of 2
1 answer
48 views

Should the original statement of the Kawada-Ito theorem assume more structure for the cosets or the subgroup?

Score of 1
0 answers
33 views

Counting 3D Regions Formed by Nested Polyhedra Constructed from Face Centroids

Score of 2
2 answers
736 views

How to find a subset of columns of a matrix which spans the entire range of matrix?

Score of 1
1 answer
110 views

Is there a strategy or formula to find the number of distinct relations on a set having same domain and range?

Score of 2
1 answer
126 views

Equal Sums of Like Powers $(11.1.n)$ for $10\le n \le 19$.

Score of 2
1 answer
559 views

Linear Transformation defined by a Matrix and Invariant Subspaces

Score of 2
1 answer
346 views

Dirichlet boundary condition and first derivatives

Score of 3
0 answers
63 views

Is it true that opening the book increases its Newtonian capacity?

Score of 6
1 answer
249 views

Does there exist a $1-1$ ring homomorphism from $M_d(\mathbb{F})$ to $M_n(\mathbb{F})$ for $d <n$?

Score of 4
1 answer
268 views

Two Properties of Perfect Rings

Score of 4
2 answers
1288 views

Not integrable although iterated integrals are equal

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