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Interesting 25 Bountied Hot Week Month
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A reference for the chromatic number of graphs when introducing twins

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Stuck on homework: Find the general solution of the differential equation $y'' - 7y' = t^2$

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Gonçalo
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2 answers
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Sigmoid vs heaviside step function

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Lukephil Brecht
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How to take the integral of (dx/dt)^2

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Jeremy Kievit
  • 63
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1 answer
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Equational theory in the language of rings with no known equational proof

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Z. A. K.
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1 vote
2 answers
53 views

sum $\sum (2^{a_1-1}-1)...(2^{a_k-1}-1)$

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Marko Riedel
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1 answer
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LOTUS and Adam's Law Nomenclature

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Starlight
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2 answers
25 views

$\frac{1}{8}x^2+\frac{23}{9}y^2=z^2$ has non-trivial solutions in $\mathbb{Q}$

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Nicolas Bourbaki
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6 votes
2 answers
83 views

How to prove the following integral inequality problem

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River Li
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1 answer
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3.5.11)Find the limit and give the strict "'$\epsilon - \delta$"' proof that the result is correct: Let $\lim_{x\to 1^{+}}$ $x\lfloor x \rfloor$

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J. W. Tanner
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How do I solve the following Volterra, non-homogeneous, 1st kind Integral Equation:

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2 votes
2 answers
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Writing a counting process $N(t)$ as $N(t) = \sum_{k=1}^{n(t)} Y_k$ : Existence and properties of $Y_k$?

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PtH
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1 answer
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Euler's Elements of Algebra Solution Method, Section III Ch. XI Problem 3.

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Fuzzy Trex
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0 answers
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Is my proof valid for Exercise 7.3 of book "Introduction to Lie Algebras" by Karin Erdmann and Mark J. Wildon

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Chen
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1 answer
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Lipschitz constant of continuous and piecewise linear functions

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2 votes
2 answers
57 views

How can I estimate the following integral: $\int _{0}^{\frac{1}{\sqrt[]{ x }}} (1-e^{-t}) ^{a-1} e^{-xt} \ dt = x^{-a} \Gamma(a) +O(x^{-a-1})$

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Gary
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4 votes
1 answer
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+50

Tamely ramified extensions of $K_{\mathfrak p}^{\mathrm{unr}}$

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Pinter set theory exercise 2.5.10

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2 votes
3 answers
81 views

Determine if $\mathbb Q (\root4 \of 5i,\sqrt3)$ is a normal extension of $\mathbb Q$.

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Just a user
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1 answer
32 views

When is $x \in \mathbb{Q}_p$ a square?

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X-Rui
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0 answers
46 views
+50

Mollification and limit

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mathex
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9 views

Approach In Learning Contour Integration Properly

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Will
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8 views

How to extend the slice map $S_f: A\otimes B \to A$ given $f \in B^*$ to the multiplier algebras?

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Squidgame
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0 answers
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An algorithm for finding the continuous addedens of a number in a sequence (...or, fitting a box in a set of other boxes--evenly)

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SlavaCat
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4 votes
2 answers
353 views

Inertia coprime to degree implies Inertia cyclic?

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KKK LLL
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2 answers
79 views

prove the following inequality using AM-GM

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Expressing a function in terms of the nontrivial zeros of the Riemann zeta function

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Mohammad Al Jamal
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Proof about adjoint matrix

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DEMB
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1 answer
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If $\frac{p}{p+q}$ is a negative real number, what can I deduce about complex $p$ and $q$?

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X-Rui
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1 answer
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A proof for the statement: The 3-Dimensional matching problem is NP-Complete

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RobPratt
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1 answer
43 views

Could you advise me on how to study pure mathematics in a self-taught way?

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5 votes
4 answers
500 views

Bounds for $\sum_{i=1}^n i^{\ln(i)}$

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Gary
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3 answers
2k views

How to correctly find the angle phi in de moivre's formula?

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2 votes
1 answer
406 views

Birthday problem with an arbitrary "year" and number of overlapping birthdays

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Henry
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0 answers
30 views

Graph with $n$ edges from each vertex, color in $n+1$ colors

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RobPratt
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1 answer
18 views

How to extend the $p \Rightarrow q$ constraint with logical AND within the $p$ statement for Big-M method?

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RobPratt
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What is the maximum area of n non-overlapping equal area triangles inscribed in a circle of radius

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1 answer
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Showing $\sum_{y \in Y} f(x_0, y) = \sum_{(x,y) \in \{x_0\} \times Y} f(x, y)$.

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Hyperbolic Cake
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1 answer
50 views

Confusion on the definition of subbasis

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Bob Dobbs
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1 answer
36 views

Is $\Diamond \Box p$ "implies" $\Box \Diamond p$ a theorem in any modal logic?

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PW_246
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Question about Chern-Simons forms

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arkeet
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3 answers
427 views
+500

Is the smallest root of a polynomial always complex if the coefficients is the sequence of prime numbers?

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Bill Dubuque
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1 answer
22 views

It there a better upper bound for $\max_{1\leq i \leq n}(a_{i}*b_{i})$?

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Hyperbolic Cake
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0 answers
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Can you suggest references for solving integrals in the complex plane that involve Bessel functions?

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J. W. Tanner
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38 views

Infinite sequence of exponents riddle

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Dylan McClish
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Covering of the torus with certain chatacteristic subgroup

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Fuze
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1 answer
2k views

How to find trajectory x displacement when it reaches a given height

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1 vote
1 answer
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Regarding the number of variables in Symmetric Functions

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Qiaochu Yuan
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1 answer
16 views

Question regarding making the subsets of a set G a G-set by left translation

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arkeet
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33 views

Serre duality for arbitrary sheaves?

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0 answers
29 views

Computing $[\mathbb{C}(x,y):\mathbb{C}(xy^n+x^ny,xy)]$ and similar extensions

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user237522
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1 vote
1 answer
16 views

Number of non-equivalent irreducible representations of a finite group $G$ over an arbitrary field $F$/non-isomorphic simple $F[G]$-modules

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Qiaochu Yuan
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1 vote
1 answer
70 views

Square matrices whose squares and pairwise products are zero

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Jair Taylor
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0 answers
46 views

Question about covering space of punctured unit disk

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Paul Frost
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18 views

How does a first order theory keep track of its axiom schemas?

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zap kabosu
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1 answer
1k views

Probability of an Event Occurring Over X Years Given Individual Annual Probabilities of the Event Occurring

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1 answer
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Every point inside a convex polyhedron can be expressed as a convex combination of the vertices.

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govindah
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4 votes
2 answers
98 views

pow and its relative error

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Penguino
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Choice of a scaling factor to flip an inequality

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shark
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0 answers
18 views

Nonhomogeneus PDE function requires expansion in sines?

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Krum Kutsarov
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0 answers
27 views

Jacobian of Isometry between regular surfaces

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Ted Shifrin
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19 views

T - Separating the space of continuous functions that are zero at infinity on a product topological space.

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nahid
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3 votes
1 answer
1k views

kernel matrix with trivial solution only

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CommunityBot
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-1 votes
1 answer
140 views

Exhaustion by compact sets $\implies$ exhaustion-function?

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peterwhy
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2 votes
3 answers
81 views

Proving that the set of limit points of a set is closed directly

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Bob Dobbs
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1 vote
0 answers
17 views

Sufficient conditions to guarantee that weakly convergent sequence also converges strongly

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prgnts123
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0 answers
20 views

Linear approximation of the magnetic dipole field

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William Lin
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1 vote
1 answer
12 views

Definiton of wild ramification group and isomorphism $\Delta \cong \prod_{s \neq \ell} \mathbb{Z}_s(1)$

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hunter
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hermitian metric on jet bundle

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Hammerhead
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1 answer
38 views

Variance of normalized random vector

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Michael
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0 answers
44 views

For quasi-coherent sheaves $\mathcal{F}, \mathcal{G}$ on a proper scheme, $\operatorname{Ext}^2(\mathcal{F},\mathcal{G}) = 0$

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fish_monster
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0 answers
19 views

Derivation of equation from Euler's equation for a fluid

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korokame
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3 votes
0 answers
73 views

How many squares can be constructed from n lines of the same length?

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lothlon
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0 answers
22 views

Is the Riemannian metric tensor of a symmetric positive definite matrix also symmetric?

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Omar Shehab
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27 views

Counterexample 3.14 of Robbin and Salamon at the paper "The spectral flow and maslov index"

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Noctis
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0 answers
15 views

Comparability Riemannian Metric in chart

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Metalhead
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1 vote
1 answer
23 views

Showing that $\bigcap A$ is the least element for the set $A$ where $A$ is a set of ordinals.

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Arturo Magidin
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2 answers
42 views

Proof of Union bound identity in Probability.

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Asaf Karagila♦
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3 votes
1 answer
80 views

Efficient algorithm to solve a sparse recovery problem

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Royi
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0 answers
37 views

Is this the correct value for integrating this differential form over a sphere?

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Nate
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0 answers
18 views

Conditioning a probability distribution on a certain event

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Daniel Robert-Nicoud
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13 views

Russian roulette with re-spin intuition for asymmetric solution

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Decaf Custom
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3 votes
4 answers
2k views

Number of Partitions of $n$ No Part Appears Exactly Once Equals to $n$ Partitioned into 0,2 ,3 or 4 (Mod 6 )

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KL_PLAS
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4 votes
0 answers
57 views

Does the Sequence formed by Intersecting Angle Bisector in a Pentagon converges?

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pie
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6 votes
0 answers
90 views

Is the new series for 𝜋 a Big (or even Medium) Deal?

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Steven Stadnicki
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0 answers
10 views

High order finite difference schemes for boundary value problems on a finite interval

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Cuhrazatee
  • 523
1 vote
0 answers
23 views

How can I solve the SDE $d X_t = -\sqrt{a X_t} dB_t$

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praskabrat
  • 21
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0 answers
17 views

Stereographic Projection Using a One-Sheeted Hyperboloid

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Anomander Rake
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4 votes
1 answer
48 views

Formula for a matrix's characteristic polynomial as the exponential of a series in $\mathrm{tr}(A^k)$

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Abezhiko
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1 vote
0 answers
18 views

Connection between sum of uniform (0,1) random variables and Poisson arrival times

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Aditi Misra
  • 21
2 votes
2 answers
106 views

Proving for n+1 and n-1 at the same time using induction.

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Malady
  • 1,261
4 votes
2 answers
855 views

Is it problematic to define the line integral in terms of infinitesimals

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Qiaochu Yuan
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1 vote
0 answers
39 views

A question about Jordan Curve Theorem

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Geomancer
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17 votes
0 answers
1k views

Placing triangles around a central triangle: Optimal Strategy?

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Benjamin Dickman
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6 votes
0 answers
2k views

The meaning of "in general" or "generally" in mathematics

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ryang
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-1 votes
2 answers
60 views

If we spin an ostrich egg along its minor axis will it be oblate shape?

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