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Interesting 9 Bountied Hot Week Month
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1 answer
763 views

Finding the best linear predictor

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Correspondence Local Systems & $\Bbb Z \pi_1(A)$-modules and its Compatibility

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0 answers
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Angle between tangents of a hyperbola

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25 views

Expressing $\tan\left(\frac{\arctan\frac12}{5}\right)$

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Dhairya Kumar
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55 votes
7 answers
116k views

What is the difference between Average and Expected value?

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Saddle Point / Steepest Descent for Bessel Functions

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2 answers
25 views

Proof of the Third Isomorphism Theorem $(G/N_1)/(N_2/N_1)\cong G/N_2$

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2 votes
4 answers
524 views

Why does this method fail for finding the Fourier series for $\cos\left(\frac{x}{2}\right)$ on the interval $-\pi \lt x \lt \pi$?

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1 vote
1 answer
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Why is it wrong to consider the highest asymptotic point as an absolute maximum of the function?

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2 votes
3 answers
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Find all generators of $ (\mathbb{Z}_{27})^{\times} $

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0 answers
4 views

Simplicial circle in motivic homotopy theory

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5 views

Problem with calculating projections of curl using rotation of coordinate system and contour

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A family of lines with more than four points is 2-colorable

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How to see $x_1\geq 0$ in the primal implies $p' A_1 \leq c_1$ in the dual, when there are no other constraints than just $x_1\geq 0$?

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Different universal bundle definitions

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1 answer
190 views

Show that $\mathfrak{Re}(\textrm{Li}_2(e^{ix}))=\frac{x^2}{4}-\frac{\pi x}{2}+\frac{\pi^2}{6}$ (polylogarithm)

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Claude Leibovici
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25 views

What is this lattice property I'm looking at?

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7 votes
1 answer
184 views

Stereometry question regarding the insphere of the tetrahedron

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2 answers
780 views

Finding the equations of surfaces of revolution

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2 votes
4 answers
187 views

Finding the angles of a non-equilateral $\triangle ABC$ with centroid $G$ such that $\angle GAB=\angle GCA=30^\circ$

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2 answers
101 views

LP Constraint Problem

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2 votes
3 answers
244 views

Prove that $a^1 \cong a$

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Attila Vajda
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5 votes
3 answers
234 views

Expectation of an absolute value

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1 vote
1 answer
59 views

How the multiplication in Ring-LWE is defined?

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1 answer
766 views

Separable kernel in convolution

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4 votes
1 answer
490 views

Necessary and sufficient conditions for the convergence of a series of complex terms

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35 views

Why does the Generalized Collatz map ($3n+k$) with $k=3^x+2^x$ produce 1,023 cycles at $x=15$, but collapse to 1 cycle for $x \ge 21$?

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2 answers
194 views

Stuck on part (b) of Rising Sun Lemma exercise

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Stochastic exponential and martingales

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1 answer
154 views

Maybe an integral inequality in discrete form?

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0 answers
47 views

Can we prove that the limit $e = \lim_{h \to 0^+} (h + 1)^{\frac1h}$ exists using the fact that the function in the limit always decreases for $h>0$?

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8 votes
1 answer
563 views

Number of lattice points inside a circle in general position

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2 votes
3 answers
119 views

Is there a similar way of proving this statement when $\mathbb{K}=\mathbb{F_2}$?

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1 vote
2 answers
818 views

Interval of Convergence for a Differential Equation

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1 answer
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Equality related to random variable and its conditional expectation.

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Davide Giraudo
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3 votes
3 answers
549 views

Number of words with 8 letters using an alphabet of 3 consonants and 2 vowels with constraints

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1 answer
34 views

Binomial sum without using sterling numbers

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0 answers
14 views

On the convolution identity of a sub arc of circle and the open set which is thickened epsilon amount of another subarc in circle.

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11 votes
1 answer
960 views

Conditional expectation continuous in the conditioning argument?

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18 votes
6 answers
3k views

Book on combinatorial identities

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How to find all polyominoes that are intersections of the integer lattice with an open disk?

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Parametrization $p x^2 + q y^2 = z^3 + r$

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765 views

How to translate a slanted cylinder? ( iso-surface geometry)

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What is an example for a GCD domain that is neither a UFD (like $\Bbb Z[X]$) nor Bézout (like holomorphic functions on all of $\Bbb C$)?

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3 answers
189 views

Analytic sum of an alternating series$\sum\limits_{n=1}^{\infty}(-1)^{n} \frac{n}{\left(n+\sqrt{a+n^2}\right)^2}$

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20 views

Complex Hessian comparison for Kähler manifolds with bisectional curvature bounded from below

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2 votes
1 answer
166 views

summing a row of the Stirling subset triangle times falling powers divided by ordinary powers

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9 votes
3 answers
405 views

Can divergent series be useful?

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1 answer
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Random variable $X$ has exponential distribution with parameter $1$. What's the probability of $p(X\leq2)$

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1 answer
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Position of two points with respective to a given straight line

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1 vote
1 answer
41 views

Function continuous nowhere whose domain and range are $[0,1]$

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Arthur
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13 votes
2 answers
402 views

Showing that $\frac{\tan(x^\circ)}{\tan(y^\circ)}= \frac{\tan(9^\circ)}{\tan(57^\circ)}$ has exactly six solutions for integers $x,y\in(0,90)$

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Limerence Abyss
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3 votes
0 answers
164 views
+50

Rational points and sections on a family of genus-3 hyperelliptic curves

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5 votes
1 answer
932 views

Smallest Number of Strings to Distinguish $n$ Pairwise $L$-distinguishable Strings

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Counting disjoint $k$-tuples of lines in $\mathbb F_q^n$

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31 views

Equivalent definitions of vector-valued Riemann integral

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10 votes
4 answers
285 views

Evaluate: $4^9-\binom{8}{1}4^8+\binom{7}{2}4^7-\binom{6}{3}4^6+\binom{5}{4}4^5$

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A Principled(?) Way to Determine a Lie Algebra Automorphism from a Dynkin Diagram Automorphism (and invariant subalgebra)

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2 answers
187 views

Doubt in Stokes' theorem & line integral

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2 answers
833 views

Two $1$-dim random walkers separated by a distance $d$ will meet at or before time $t$.

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1 vote
1 answer
534 views

An upper bound for $-\frac{\zeta'}{\zeta}(s)-\frac{1}{s-1}$

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1 answer
506 views

Riemann zeta function, Stirling's numbers, and infinite series of rising/falling powers over ordinary powers

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0 answers
17 views

Every k-fold cover of the real line by intervals can be decomposed into k distinct covers.

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7 votes
4 answers
309 views

What is the correct definition of a limit point in real analysis?

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0 answers
19 views

Continuity of functions in b-metric spaces

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mark haokip
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2 votes
1 answer
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Dimension of a diagonalizable matrix

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2 answers
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How $\min(x,y)$ works in reasoning

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Bill Dubuque
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2 votes
0 answers
39 views

Can you find a great circle with only a compass?

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Steven Stadnicki
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1 answer
262 views

Partial sum of Stirling numbers of the second kind with falling factorial

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2 votes
2 answers
170 views

What is wrong with my derivation of the surface area of a sphere?

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1 vote
1 answer
37 views

Generalization of Cauchy's functional equation. What are the general solutions, $f$?

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Bruno Andrades
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1 vote
1 answer
56 views

Density of the set of positive triplets $(x,y,z)$ such that $x^{n_1}+y^{n_2}=z^{n_3}$ for positive integers $n_i$ in the halfopen unit cube $(0,1]^3$

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1 answer
468 views

Showing ${n\brace k}^2>{n\brace k-1}{n\brace k+1}$ by induction on $n$

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2 votes
1 answer
155 views

How do you think about uniform continuity?

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Ben
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4 votes
2 answers
89 views

Known properties of these generalized Cauchy distributions

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3 votes
1 answer
540 views

No eigenvalue of a graph is larger than the maximum degree

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minh quý lê
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3 votes
1 answer
150 views

Cubic non-residue calculation

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1 vote
1 answer
34 views

Periodic Orbits of Arbitrarily Small Period for a Flow Without Fixed Points

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0 answers
56 views

Limit of the function satisfying $f(x)=x-f(x^2)$ as $x\to 1^-$

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1 answer
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If a sequence of functions is zero almost everywhere and converges pointwise almost everywhere, does the same hold for a limit?

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“Central limit theorem” for symmetric random variables with no finite mean

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5 votes
1 answer
79 views

A gap in a game theory derivation

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0 answers
31 views

How are defined these double complexes in Bott Tu, Section 14?

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1 answer
36 views

Is $A_{\epsilon}=\{x \in X: d(x,A) \leq \epsilon\}$ a continuum metric space?

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0 answers
22 views

Practical and historical role of Jordan measure

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0 answers
17 views

Asymptotic Expansion of Bessel Function using Sommerfeld Contour

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Joel Storch
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0 answers
16 views

Is a collinearity step missing in this Miquel point proof?

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Ahan
  • 139
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1 answer
811 views

At Most Countable Sets: Finite vs Countable

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1 vote
0 answers
36 views

How much less is the arithmetic mean than the max given the average deviation?

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0 answers
22 views

Criterion for abelian subcategory

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87 views

What are the curves of constant affine curvature in dimension $>2$? Are they still polynomial?

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$F(x,y)=2x^4-3x^2y+y^2$. Show that $(0,0)$ is local minimum of the Reduction of F for every linear line that passes through $(0,0)$.

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4 votes
0 answers
76 views

The exact meaning of ‘subject to that’ in this context

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Rócherz
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5 votes
1 answer
298 views

Integral evaluation

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Dhairya Kumar
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3 votes
1 answer
974 views

How to translate math technical terms?

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1 vote
1 answer
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If $f$ is absolutely continuous and $g$ is Lipschitz, then $f \circ g$ is absolutely continuous.

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