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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.

439 posts RSS
Activity Age Score Random
Filters (None)
75%
+4 −0
Fourier transform of an $L^1$ function is uniformly continuous

1 answer  ·  posted 2y ago by Snoopy‭  ·  last activity 1d ago by Snoopy‭

real-analysis fourier-analysis
75%
+4 −0
"Weaker" versus "stronger" topologies

0 answers  ·  posted 1mo ago by Michael Hardy‭  ·  edited 1mo ago by Michael Hardy‭

topology terminology
71%
+3 −0
Can the relative magnitude of standardized coefficients indicate variable importance?

2 answers  ·  posted 2y ago by sam‭  ·  last activity 1mo ago by Michael Hardy‭

statistics regression
66%
+2 −0
What $\equiv$ called?

3 answers  ·  posted 5y ago by Anonymous‭  ·  edited 1mo ago by Michael Hardy‭

symbols
50%
+1 −1
Why isn't $\Pr(diseased|+ test) = \dfrac{\text{number of true positives}}{\text{number of false positives}}$?

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

probability
66%
+2 −0
Can expectation be calculated if the events aren't numbered?

2 answers  ·  posted 3mo ago by Ooker‭  ·  last activity 1mo ago by Michael Hardy‭

probability measure-theory lebesgue-measure
77%
+5 −0
Why is the union of two topologies not in general a topology?

2 answers  ·  posted 5mo ago by clemens‭  ·  last activity 1mo ago by Michael Hardy‭

topology set-theory
66%
+2 −0
Stone–Čech compactification and ultrafilters

0 answers  ·  posted 2mo ago by clemens‭  ·  edited 1mo ago by Michael Hardy‭

topology compactness ultrafilters
77%
+5 −0
Finding the limit $ \lim_{x\to 0^+}e^{1/x}\sum_{n=\lfloor 1/x\rfloor}^\infty\frac{x^n}{n} $

2 answers  ·  posted 3y ago by Snoopy‭  ·  edited 1mo ago by Snoopy‭

real-analysis limits
75%
+4 −0
In this representation of surreal numbers and gaps with classes of ordinal numbers, are all gaps represented?

1 answer  ·  posted 9mo ago by celtschk‭  ·  last activity 2mo ago by clemens‭

set-theory ordinal-numbers surreal-numbers
81%
+7 −0
For which spaces are all continuous functions either constant or the identity?

1 answer  ·  posted 2y ago by celtschk‭  ·  last activity 2mo ago by clemens‭

topology
40%
+0 −1
How to find dualized quantifier pairs in substitutionally quantified analysis?

1 answer  ·  posted 2mo ago by Ripheus24‭  ·  last activity 2mo ago by clemens‭

logic analysis
80%
+6 −0
Is there an equational law satisfied by "linear kei" but not free kei?

1 answer  ·  posted 1y ago by WheatWizard‭  ·  last activity 2mo ago by clemens‭

geometry abstract-algebra
40%
+0 −1
Area of a (planar) quadrilateral using two opposite sides and four angles

1 answer  ·  posted 2mo ago by Ryo TAKA‭  ·  last activity 2mo ago by tommi‭

geometry euclidean-geometry
66%
+2 −0
Lifting a graph "folding" to a covering space

0 answers  ·  posted 1y ago by WheatWizard‭  ·  last activity 2mo ago by clemens‭

graph-theory algebraic-topology
71%
+3 −0
What's the complexity of this algorithm for solving the maximum clique NP-Complete problem?

1 answer  ·  posted 3mo ago by alx‭  ·  last activity 2mo ago by clemens‭

computational-mathematics
33%
+0 −2
Over-infinite growth rates

0 answers  ·  posted 2mo ago by Anixx‭  ·  edited 2mo ago by Anixx‭

surreal-numbers laplace-transform hardy-fields
33%
+0 −2
Construction, similar to Chow's EL-numbers. Is it valid? What are the properties?

0 answers  ·  posted 2mo ago by Anixx‭  ·  edited 2mo ago by Anixx‭

algebra ring-theory fields constants
40%
+0 −1
With what classes of functions does the equality $\int_0^\infty f(x)dx=\int_0^\infty\mathcal{L}_tt f(t) dx$ lead to paradoxes?

0 answers  ·  posted 2mo ago by Anixx‭  ·  last activity 2mo ago by Anixx‭

calculus improper-integral divergent-integrals laplace-transform
33%
+0 −2
I faced this claim in a paper and cannot get it: "Assuming CH, every maximal Hardy field is isomorphic to $(\bf{No}(\omega_1), \partial_{\omega_1})$"

0 answers  ·  posted 2mo ago by Anixx‭  ·  edited 2mo ago by Anixx‭

set-theory measure-theory hardy-fields
50%
+1 −1
Gender distribution probability

1 answer  ·  posted 2mo ago by Anixx‭  ·  last activity 2mo ago by clemens‭

probability
60%
+1 −0
The role of regexps/finite automata in quantifier elimination for Presburger arithmetic

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

logic peano-arithmetic formal-language
33%
+0 −2
Defining a explicit function, without axiom of choice, that is not Lebesgue integrable on any interval?

2 answers  ·  posted 5mo ago by bharathk98‭  ·  edited 2mo ago by bharathk98‭

definition mean hausdorff-dimension hausdorff-measure
40%
+0 −1
Otherwise similar functions with opposite parity, were they considered, are they useful? Case of polynomials

1 answer  ·  posted 2mo ago by Anixx‭  ·  last activity 2mo ago by tommi‭

generating-functions special-functions parity
66%
+2 −0
Is there a stable/consistent extension of wheel theory to alephs?

3 answers  ·  posted 5mo ago by Ripheus24‭  ·  last activity 2mo ago by Anixx‭

set-theory arithmetic
42%
+1 −2
What are the properties of square-matrix algebra with this equivalence class?

0 answers  ·  posted 2mo ago by Anixx‭

matrices ring-theory
40%
+0 −1
Why we can analytically define ε in dual numbers so to distinguish ε from −ε but cannot do so in complex and split-complex numbers?

1 answer  ·  posted 2mo ago by Anixx‭  ·  last activity 2mo ago by clemens‭

abstract-algebra ring-theory
50%
+0 −0
Can we add additional structure to the umbral ring?

0 answers  ·  posted 2mo ago by Anixx‭  ·  edited 2mo ago by Anixx‭

umbral-calculus ring-theory
84%
+9 −0
Does there exist a non-zero game such that the sum of three or more copies of it is zero?

1 answer  ·  posted 4y ago by celtschk‭  ·  last activity 2mo ago by clemens‭

combinatorial-game-theory
71%
+3 −0
Are there combinatorial games $G$ such that $G+G$ is fuzzy?

1 answer  ·  posted 3mo ago by clemens‭  ·  last activity 2mo ago by r~~‭

combinatorial-game-theory
71%
+3 −0
Is the nth Betti number determined by orientability?

2 answers  ·  posted 2y ago by WheatWizard‭  ·  last activity 2mo ago by clemens‭

betti-numbers algebraic-topology
60%
+1 −0
How important results in classical statistics be generalized when codomain of the measure is not $\mathbb R$?

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

probability statistics measure-theory
71%
+3 −0
When is proof of provability a proof?

1 answer  ·  posted 3mo ago by Hernán Ibarra Mejia‭  ·  last activity 3mo ago by clemens‭

set-theory logic
40%
+0 −1
Averaging an Explicit, Non-Lebesgue Integrable, and Unbounded Function That Is Defined Without The Axiom of Choice

0 answers  ·  posted 3mo ago by bharathk98‭  ·  edited 3mo ago by bharathk98‭

analysis real-analysis recreational-mathematics mean hausdorff-measure
85%
+10 −0
Are there useful topologies on Cartesian products “in between” the product topology and the box topology?

1 answer  ·  posted 5y ago by celtschk‭  ·  last activity 3mo ago by clemens‭

topology
50%
+1 −1
Algebraic geometry references that study this triple? [closed]

0 answers  ·  posted 3mo ago by zetaspace‭  ·  closed 3mo ago by ArtOfCode‭

algebraic-geometry reference-request geometric-group-theory
66%
+2 −0
Canonical Homomorphism $G_{2\times 2} \to \mathrm{PGL}(3,2)$?

1 answer  ·  posted 3mo ago by zetaspace‭  ·  last activity 3mo ago by clemens‭

abstract-algebra group-theory
50%
+1 −1
Does the $3+4$ coloring $\chi$ determine the homomorphism $\rho_{\chi}$?

1 answer  ·  posted 3mo ago by zetaspace‭  ·  last activity 3mo ago by clemens‭

abstract-algebra combinatorics group-theory representation-theory geometric-group-theory
66%
+2 −0
The Fenchel–Moreau theorem; or, how to generalize convex conjugate intuition to the N-dimensional case?

1 answer  ·  posted 3mo ago by clemens‭  ·  last activity 3mo ago by tommi‭

multivariable-calculus convex-analysis vector-space
80%
+6 −0
All numbers are triangular modulo $N$ iff $N$ is a power of $2$?

2 answers  ·  posted 2y ago by celtschk‭  ·  last activity 4mo ago by clemens‭

modular-arithmetic
75%
+4 −0
Prove that if $X^X$ is a terminal object then $X \to \mathbf{1}$ is a monomorphism

2 answers  ·  posted 4mo ago by Hernán Ibarra Mejia‭  ·  last activity 4mo ago by clemens‭

category-theory
57%
+2 −1
Consequences of NP-Complete in QP?

2 answers  ·  posted 4mo ago by alx‭  ·  last activity 4mo ago by Peter Taylor‭

computational-mathematics
71%
+3 −0
Quotation notation in mathematics

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

logic notation
66%
+2 −0
Upper bound of the complexity of an algorithm on two variables

1 answer  ·  posted 4mo ago by alx‭  ·  last activity 4mo ago by clemens‭

computational-mathematics
75%
+4 −0
How to determine a precise upper bound of the growth rate with a product series?

1 answer  ·  posted 4mo ago by alx‭  ·  edited 4mo ago by tommi‭

series computational-mathematics
57%
+2 −1
Would sesquation have identity element 0, 1, or something else?

0 answers  ·  posted 4mo ago by Ripheus24‭

limits arithmetic
75%
+4 −0
Topological field structures on $\mathbb{Q}$ not generated by the $p$-adic and Archimedean topologies?

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

topology abstract-algebra
80%
+6 −0
Are there other topologies on $\mathbb R$ that make it a topological field?

3 answers  ·  posted 1y ago by celtschk‭  ·  last activity 4mo ago by clemens‭

topology
77%
+5 −0
Are there multiple (small class) extensions of the naturals?

1 answer  ·  posted 5mo ago by wizzwizz4‭  ·  last activity 5mo ago by clemens‭

number-theory abstract-algebra
77%
+5 −0
Why are regular languages closed under intersection and complementation?

2 answers  ·  posted 5mo ago by clemens‭  ·  last activity 5mo ago by Peter Taylor‭

computational-mathematics formal-language
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