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General Q&A about all branches of theoretical and applied mathematics, including closely-adjacent sciences where the central question is about the math.

369 posts RSS
Activity Age Score Random
Filters (None)
60%
+1 −0
Compactness of the Propositional Calculus

1 answer  ·  posted 9d ago by kouty ‭  ·  edited 4d ago by kouty ‭

logic
70%
+5 −1
How to validate if the horizontal and vertical tangent lines exist for implicit functions?

2 answers  ·  posted 29d ago by Bennyshinichi‭  ·  last activity 8d ago by Snoopy‭

calculus differentiation
60%
+1 −0
Area of the surface of revolution of a Reuleaux triangle

1 answer  ·  posted 2mo ago by JRN‭  ·  last activity 2mo ago by JRN‭

area Reuleaux-triangle surface-of-revolution
60%
+1 −0
Volume enclosed by the surface of revolution of a Reuleaux triangle

1 answer  ·  posted 2mo ago by JRN‭  ·  last activity 2mo ago by JRN‭

volume Reuleaux-triangle surface-of-revolution
70%
+5 −1
Probability that six random numbers between 0 and 1 are the lengths of a tetrahedron's edges

0 answers  ·  posted 3mo ago by JRN‭  ·  edited 2mo ago by JRN‭

probability
75%
+4 −0
How do I (efficiently) sample from the interior of a convex polytope?

0 answers  ·  posted 3mo ago by purplenanite‭  ·  edited 3mo ago by purplenanite‭

statistics convex-hull polytopes sampling
25%
+0 −4
Why does group play equalize a lottery's actual Expected Value to the effective Expected Value? [closed]

0 answers  ·  posted 3mo ago by Nen‭  ·  closed 3mo ago by Peter Taylor‭

lottery
71%
+3 −0
How to prove that solutions of semilinear differential equations is even function?

0 answers  ·  posted 3mo ago by Richard‭

calculus partial-differential-equations
71%
+3 −0
Why $\gamma\cdot\operatorname{grad}u<0$ in the Theorem? (Nirenberg academic paper)

1 answer  ·  posted 4mo ago by Richard‭  ·  edited 4mo ago by Snoopy‭

geometry functional-analysis partial-differential-equations
40%
+0 −1
Questions regarding the Kurepa Conjecture

0 answers  ·  posted 4mo ago by Math_Maven‭  ·  edited 4mo ago by Math_Maven‭

number-theory soft-question reference-request factorial conjecture
66%
+2 −0
Reflection in the plane with polar coordinates

1 answer  ·  posted 4mo ago by Richard‭  ·  last activity 4mo ago by Richard‭

geometry coordinate-geometry linear-algebra polar
66%
+2 −0
Holomorphic function on a connected bounded open subset of the complex plane

1 answer  ·  posted 4mo ago by Snoopy‭  ·  last activity 4mo ago by Snoopy‭

complex-analysis
66%
+2 −0
Does the series $\sum_{n=1}^{\infty} \frac{n^n}{n!} e^{-n}$ converge?

2 answers  ·  posted 4mo ago by Snoopy‭  ·  last activity 4mo ago by Snoopy‭

calculus real-analysis series
60%
+1 −0
Complex functions and inner product $\langle \frac{\partial f}{\partial z} , g\rangle $

2 answers  ·  posted 5mo ago by Richard‭  ·  last activity 4mo ago by Richard‭

complex-analysis summation integral functional-analysis
42%
+1 −2
Search & Probability

2 answers  ·  posted 5mo ago by Hudjefa‭  ·  last activity 5mo ago by Olin Lathrop‭

probability
71%
+3 −0
Is there a closed formula for multiplication of imaginary units in the direct limit of the Cayley-Dickson construction?

1 answer  ·  posted 5mo ago by celtschk‭  ·  last activity 5mo ago by r~~‭

algebra
71%
+3 −0
Find the value of $\sum_{k=1}^\infty\frac{k^2}{k!}$

3 answers  ·  posted 5mo ago by Snoopy‭  ·  last activity 5mo ago by Derek Elkins‭

complex-analysis real-analysis series
66%
+2 −0
What does it mean by saying that $C([0,1])$ is a subset of $L^\infty([0,1])$?

2 answers  ·  posted 12mo ago by Snoopy‭  ·  last activity 5mo ago by celtschk‭

real-analysis
80%
+6 −0
Does this generalization of path-connectedness also cover general connectedness?

1 answer  ·  posted 4y ago by celtschk‭  ·  last activity 5mo ago by ronno‭

topology connectedness
50%
+0 −0
Find all functions \(f:\mathbb N\to\mathbb N\) such that for all primes \(p\), \(p\mid f(a)^{f(p)}-f(b)^p\iff p\mid a-b\)

0 answers  ·  posted 5mo ago by TheCodidacter, or rather ACodidacter‭  ·  edited 5mo ago by TheCodidacter, or rather ACodidacter‭

functions solution-verification modular-arithmetic
71%
+3 −0
Am I taking the antiderivative of |x| correctly?

1 answer  ·  posted 8mo ago by CrSb0001‭  ·  edited 5mo ago by The Amplitwist‭

calculus integration recreational-mathematics
33%
+1 −4
Without trial and error, how can I effortlessly deduce all $n, k_i ∈ ℕ ∋ \binom n {k_1, k_2, ..., k_n} =$ given c?

1 answer  ·  posted 1y ago by Chgg Clou‭  ·  edited 5mo ago by Michael Hardy‭

combinatorics
77%
+5 −0
What is the probability density function for the tau distribution?

2 answers  ·  posted 1y ago by mr Tsjolder‭  ·  last activity 5mo ago by Michael Hardy‭

statistics distributions
60%
+1 −0
The effect of measurement accuracy and rounding on hypothesis testing

1 answer  ·  posted 8mo ago by tommi‭  ·  last activity 5mo ago by Michael Hardy‭

statistics hypothesis-testing rounding
66%
+2 −0
Example of $f:[0,1]\to\mathbf{R}$ with $\lim_{a\to 0^+}\int_a^1f(x)dx=L $ for some real number $L$ but $\int_0^1|f(x)|dx=\infty $

2 answers  ·  posted 2y ago by Snoopy‭  ·  last activity 5mo ago by Michael Hardy‭

real-analysis improper-integral
75%
+4 −0
Is it known whether most numbers are normal or not

1 answer  ·  posted 1y ago by Grove‭  ·  last activity 5mo ago by Michael Hardy‭

number-theory
71%
+3 −0
The derivatives of a function at a boundary point

2 answers  ·  posted 11mo ago by tommi‭  ·  last activity 5mo ago by Michael Hardy‭

derivatives real-analysis
44%
+2 −3
How can you forebode that the answer shall be independent of the number of sides of the base of the polygon ?

1 answer  ·  posted 6mo ago by Sunny‭  ·  last activity 5mo ago by Michael Hardy‭

calculus
66%
+4 −1
Minimal non-standard number in non-standard models of PA

2 answers  ·  posted 10mo ago by Aditya‭  ·  last activity 5mo ago by Michael Hardy‭

logic model peano-arithmetic nonstandard-models
71%
+3 −0
$\liminf (a_n+b_n) = \liminf(a_n)+\liminf(b_n)$ provided that $\lim a_n$ exists

1 answer  ·  posted 12mo ago by Snoopy‭  ·  last activity 5mo ago by Snoopy‭

real-analysis limits
72%
+6 −1
What is the formula for sample standard deviation of a small sample size?

3 answers  ·  posted 1y ago by Ivan Nepomnyashchikh‭  ·  last activity 5mo ago by Peter Taylor‭

statistics
66%
+2 −0
Why does the method of separating variables work?

2 answers  ·  posted 9mo ago by The Amplitwist‭  ·  last activity 6mo ago by Snoopy‭

partial-differential-equations separation-of-variables
71%
+3 −0
For which spaces are all continuous functions either constant or the identity?

0 answers  ·  posted 6mo ago by celtschk‭  ·  edited 6mo ago by celtschk‭

topology
50%
+0 −0
How can we prove that a point that follows another point has the same trajectory given a contant angle and ratio?

1 answer  ·  posted 6mo ago by Bennyshinichi‭  ·  last activity 6mo ago by Peter Taylor‭

geometry vector
75%
+4 −0
Formalizing proof of existence of roots of functional equation

1 answer  ·  posted 6mo ago by zayn‭  ·  last activity 6mo ago by Peter Taylor‭

algebra functional-analysis
60%
+1 −0
Can the relative magnitude of standardized coefficients indicate variable importance?

0 answers  ·  posted 6mo ago by sam‭  ·  edited 6mo ago by trichoplax‭

statistics regression
28%
+0 −3
How can I improve this tree diagram, for the Multivariable Chain Rule with all partial derivatives? [duplicate]

0 answers  ·  posted 6mo ago by Sunny‭  ·  closed as duplicate 6mo ago by Peter Taylor‭

multivariable-calculus
44%
+2 −3
How can you forebode that amount of wood in a napkin ring is the same, regardless of the size of the sphere used ?

1 answer  ·  posted 6mo ago by Sunny‭  ·  edited 6mo ago by Sunny‭

intuition calculus
28%
+0 −3
Why do students mix up addition and multiplication, in the Multivariable Chain Rule with all partial derivatives?

0 answers  ·  posted 6mo ago by Sunny‭  ·  edited 6mo ago by Sunny‭

multivariable-calculus
60%
+1 −0
Interpreting $\text{Prop}$ in Set

1 answer  ·  posted 6mo ago by user205‭  ·  last activity 6mo ago by Derek Elkins‭

type-theory
75%
+4 −0
How to find a point on a vector equation with another vector equation and perpendicular distance?

2 answers  ·  posted 7mo ago by Bennyshinichi‭  ·  last activity 6mo ago by TheCodidacter, or rather ACodidacter‭

vector
71%
+3 −0
All numbers are triangular modulo $N$ iff $N$ is a power of $2$?

1 answer  ·  posted 7mo ago by celtschk‭  ·  last activity 7mo ago by Peter Taylor‭

modular-arithmetic
81%
+7 −0
Endomorphisms on an entropic structure whose pointwise product is the identity automorphism - entropic idempotent structure?

1 answer  ·  posted 2y ago by Prime Mover‭  ·  last activity 7mo ago by Derek Elkins‭

abstract-algebra
81%
+7 −0
Does this construction always give a topological vector space?

1 answer  ·  posted 3y ago by celtschk‭  ·  last activity 7mo ago by JohnnyJohn‭

topology linear-algebra topological-vector-spaces
66%
+2 −0
Does "shift of terms" in a Faber–Schauder series expansion of f ∈ C[0,1] produce an element of C[0,1]?

0 answers  ·  posted 7mo ago by KamilPrzespolewski‭  ·  edited 7mo ago by KamilPrzespolewski‭

functional-analysis Banach-space
71%
+3 −0
What is an example of a pathological imbedding of a(n allowed) graph into an oriented surface?

1 answer  ·  posted 10mo ago by The Amplitwist‭  ·  last activity 7mo ago by The Amplitwist‭

topology graph-theory
60%
+1 −0
How do I unambiguously define the facial circuits in a $2$-cell embedding of a graph into a surface?

1 answer  ·  posted 8mo ago by The Amplitwist‭  ·  last activity 7mo ago by The Amplitwist‭

topology graph-theory
44%
+2 −3
Cyclical or “loop” fractals?

2 answers  ·  posted 11mo ago by Julius H.‭  ·  last activity 8mo ago by pbloem‭

real-analysis fractal
66%
+2 −0
Seeking a theorem about lattices

1 answer  ·  posted 8mo ago by WheatWizard‭  ·  last activity 8mo ago by Lisanne‭

linear-algebra reference-request free-abelian-group
77%
+5 −0
How to find perfect squares such that their base 9 representation is all 1s?

1 answer  ·  posted 8mo ago by CrSb0001‭  ·  last activity 8mo ago by Lisanne‭

number-theory bases recreational-mathematics
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