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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.

416 posts RSS
Activity Age Score Random
Filters (None)
66%
+2 −0
Quotation notation in mathematics

1 answer  ·  posted 5d ago by clemens‭  ·  last activity 14h ago by clemens‭

logic notation
57%
+2 −1
Consequences of NP-Complete in QP?

1 answer  ·  posted 2d ago by alx‭  ·  last activity 1d ago by clemens‭

computational-mathematics
60%
+1 −0
What relation does the density-in-itself and metrizability of a topology have to whether its closure operator satisfies the S4 modal logic axioms?

0 answers  ·  posted 2d ago by clemens‭  ·  edited 1d ago by clemens‭

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

1 answer  ·  posted 3d ago by alx‭  ·  last activity 2d 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 4d ago by alx‭  ·  edited 3d ago by tommi‭

series computational-mathematics
50%
+1 −1
Would sesquation have identity element 0, 1, or something else?

0 answers  ·  posted 17d ago by Ripheus24‭

limits arithmetic
71%
+3 −0
Topological field structures on $\mathbb{Q}$ not generated by the $p$-adic and Archimedean topologies?

0 answers  ·  posted 19d ago by clemens‭  ·  edited 19d 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 21d ago by clemens‭

topology
75%
+4 −0
Are there multiple (small class) extensions of the naturals?

1 answer  ·  posted 23d ago by wizzwizz4‭  ·  last activity 22d ago by clemens‭

number-theory abstract-algebra
75%
+4 −0
Why is the union of two topologies not in general a topology?

1 answer  ·  posted 23d ago by clemens‭  ·  edited 23d ago by clemens‭

topology set-theory
77%
+5 −0
Why are regular languages closed under intersection and complementation?

2 answers  ·  posted 1mo ago by clemens‭  ·  last activity 27d ago by Peter Taylor‭

computational-mathematics formal-language
75%
+4 −0
Is it possible to force $2^{\mathfrak{X}} = 2^{\aleph_0}$ for some non-aleph $\mathfrak{X}$?

0 answers  ·  posted 29d ago by Ripheus24‭

set-theory logic arithmetic continuity
50%
+0 −0
Finding a non-trivial, rigorous definition of a "measure zero" and "full measure" subset of a set of function spaces which satisfies the following?

0 answers  ·  posted 1mo ago by bharathk98‭  ·  edited 29d ago by bharathk98‭

statistics mean functional-analysis hausdorff-dimension hausdorff-measure
71%
+3 −0
How can one prove Tychonoff's theorem using ultrafilters?

1 answer  ·  posted 1mo ago by clemens‭  ·  last activity 1mo ago by Derek Elkins‭

topology set-theory
66%
+2 −0
Is there a stable/consistent extension of wheel theory to alephs?

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

set-theory arithmetic
50%
+0 −0
What is the reason this example of an everywhere surjective function have or does not have an undefined mean?

2 answers  ·  posted 2mo ago by bharathk98‭  ·  last activity 1mo ago by bharathk98‭

analysis functions mean hausdorff-dimension hausdorff-measure
50%
+0 −0
Finding a non-trivial, rigorous definition of a "full measure" subset of a set of function spaces which satisfies the following (pt. 2)?

0 answers  ·  posted 2mo ago by bharathk98‭  ·  edited 1mo ago by bharathk98‭

mean functional-analysis reference-request hausdorff-dimension hausdorff-measure
71%
+3 −0
Multivariate urn/coupon collector problem without replacement

1 answer  ·  posted 1mo ago by Dylan Callaghan‭  ·  last activity 1mo ago by clemens‭

probability combinatorics
50%
+0 −0
Finding a non-trivial, rigorous definition of a "full measure" subset of a set of function spaces which satisfies the following (pt. 1)?

0 answers  ·  posted 2mo ago by bharathk98‭  ·  edited 1mo ago by bharathk98‭

mean functional-analysis reference-request hausdorff-dimension hausdorff-measure
50%
+0 −0
Finding a non-trivial, rigorous definition of a "measure zero" subset of a set of function spaces which satisfies the following?

0 answers  ·  posted 2mo ago by bharathk98‭  ·  edited 1mo ago by bharathk98‭

mean functional-analysis reference-request hausdorff-dimension hausdorff-measure
28%
+0 −3
When does Exclusive Or, ⊕, automatically become Inclusive Or?

2 answers  ·  posted 2mo ago by deleted user  ·  last activity 1mo ago by wizzwizz4‭

logic
50%
+0 −0
Defining a explicit function, without axiom of choice, that is not Lebesgue integrable on any interval?

2 answers  ·  posted 2mo ago by bharathk98‭  ·  edited 1mo ago by bharathk98‭

definition mean hausdorff-dimension hausdorff-measure
71%
+3 −0
Compactness of the Propositional Calculus

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

logic
80%
+6 −0
What complexity implications are there from not being in an abstract family of languages?

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

formal-language abstract-family-of-languages
28%
+0 −3
Though a disaster, why did “New Mathematics” assist and boost some high school students suffering from ADHD and Dyscalculia?

0 answers  ·  posted 2mo ago by deleted user  ·  edited 2mo ago by deleted user

high-school-mathematics
33%
+0 −2
Why did replacing algebra geometry trig ― with “more abstract topics such as sets, groups, rings, and fields” ― help students “see things faster” ?

0 answers  ·  posted 2mo ago by deleted user

abstract-algebra
50%
+1 −1
What is an applicable way of averaging an everywhere surjective function whose graph has Hausdorff dimension $2$ with zero $2$-d Hausdorff measure?

0 answers  ·  posted 4mo ago by bharathk98‭  ·  edited 2mo ago by bharathk98‭

probability functions sequence mean functional-analysis
27%
+1 −6
Please draw this picture to distinguish between Convex and Concave functions, featuring “bear in a conCAVE” mnemonic?

1 answer  ·  posted 4mo ago by deleted user  ·  last activity 3mo ago by Glen_b‭

visualization
50%
+1 −1
Solving 2nd order nonlinear ordinary differential equations

0 answers  ·  posted 3mo ago by cpe_abdullah‭

ordinary-differential-equations nonlinear-odes
33%
+0 −2
What explains the Inventor’s Paradox? Why can more general problems, paradoxically, be easier to solve or prove?

1 answer  ·  posted 4mo ago by deleted user  ·  last activity 4mo ago by Derek Elkins‭

proof
77%
+5 −0
How many elements are present in the subset of null set ?

1 answer  ·  posted 5mo ago by Hemanth B S‭  ·  last activity 5mo ago by tommi‭

high-school-mathematics set-theory
71%
+3 −0
How to justify: for every integer $r$ in $[1, k-1]$, there is an integer $j$ in $[0, k-1]$, such that $r + j = k$

2 answers  ·  posted 5mo ago by Penelope‭  ·  last activity 5mo ago by Derek Elkins‭

number-theory
25%
+0 −4
why do lotteries require computer to generate some set of numbers, instead of letting players pick all numbers?

1 answer  ·  posted 9mo ago by RichmGreen‭  ·  last activity 5mo ago by watchmaker‭

lottery
71%
+3 −0
In this representation of surreal numbers and gaps with classes of ordinal numbers, are all gaps represented?

0 answers  ·  posted 5mo ago by celtschk‭

set-theory ordinal-numbers surreal-numbers
77%
+5 −0
Is this a proper measure for irrationality?

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

classification
40%
+0 −1
Papers which solve the summary of my paper involving expectations, hausdorff measure, prevelant/shy sets, partitions, samples, pathways & entropy.

1 answer  ·  posted 6mo ago by bharathk98‭  ·  last activity 6mo ago by tommi‭

analysis functional-analysis reference-request hausdorff-dimension hausdorff-measure
80%
+6 −0
Name for a graph invariant: minimal positive integer $d$ such that the graph is $d$-biclique-free

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

nomenclature graph-theory graph-invariant undirected-graph
80%
+6 −0
Is the "mucube" homeomorphic to the loch ness monster?

1 answer  ·  posted 9mo ago by WheatWizard‭  ·  last activity 8mo ago by WheatWizard‭

topology
22%
+0 −5
Why better to buy one ticket for multiple draws, instead of multiple tickets for the same draw - in terms of variance, skewness, kurtosis?

0 answers  ·  posted 9mo ago by RichmGreen‭

lottery
72%
+6 −1
How to validate if the horizontal and vertical tangent lines exist for implicit functions?

2 answers  ·  posted 1y ago by Bennyshinichi‭  ·  last activity 9mo ago by Monica Cellio‭

calculus differentiation
66%
+2 −0
What is the unit element in the space of more-than-2 indexed tensors?

0 answers  ·  posted 10mo ago by peterh‭  ·  edited 10mo ago by peterh‭

tensors
66%
+2 −0
Lifting a graph "folding" to a covering space

0 answers  ·  posted 10mo ago by WheatWizard‭  ·  edited 10mo ago by WheatWizard‭

graph-theory algebraic-topology
77%
+5 −0
How to understand the distribution of a random variable constrained on a linear system of equations?

0 answers  ·  posted 12mo ago by mr Tsjolder‭

proof linear-algebra distributions
60%
+1 −0
What are the known chiral polytopes of full rank?

1 answer  ·  posted 12mo ago by WheatWizard‭  ·  last activity 12mo ago by WheatWizard‭

euclidean-geometry polytopes
57%
+2 −1
What are some introductory texts for learning acoustics modeling using FEM-BEM simulations?

0 answers  ·  posted 12mo ago by mavavilj‭  ·  edited 12mo ago by mavavilj‭

reference-request fem bem acoustics
66%
+2 −0
The effect of measurement accuracy and rounding on hypothesis testing

2 answers  ·  posted 2y ago by tommi‭  ·  last activity 12mo ago by deleted user

statistics hypothesis-testing rounding
76%
+8 −1
Probability that six random numbers between 0 and 1 are the lengths of a tetrahedron's edges

0 answers  ·  posted 1y ago by JRN‭  ·  last activity 12mo ago by deleted user

probability
77%
+5 −0
Prime factor pattern in numbers one less than a power of 2

1 answer  ·  posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

power pattern factoring Prime-numbers
50%
+0 −0
Does the root of the Taylor series expansion converge to the inverse of a function as the number of terms increases?

0 answers  ·  posted 1y ago by theabbie‭

limits polynomials series taylor-expansion
75%
+4 −0
Is there an equational law satisfied by "linear kei" but not free kei?

0 answers  ·  posted 1y ago by WheatWizard‭  ·  last activity 1y ago by celtschk‭

geometry abstract-algebra
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