Questions tagged [visualization]
The visualization tag has no usage guidance.
48 questions
4
votes
1
answer
420
views
Visualizing the elements of a finite group and does the Gram matrix determine the finite group?
Let $G$ be a finite group with $n = |G|$ elements. By Cayley's theorem for finite groups, we have an injective homomorphism of groups:
$$
\pi : G \rightarrow S_n, \quad g \mapsto \pi(g)
$$
where ...
- 3,032
4
votes
1
answer
294
views
Why should we expect this odd behavior of negative binomial distributions?
In independent Bernoulli trials with probability $p$ of success on each trial, let $X$ be the number of failures before the $n$th success. Then
$$
\Pr(X=x) = \binom{-n}{\phantom{+}x} (-q)^x p^n \text{ ...
8
votes
0
answers
558
views
What is the nicest bijection $\textbf{R}^p \to \textbf{R}^q$ that you know?
It is well-known that bijection between $\textbf{R}^p$ and $\textbf{R}$ exist (e.g. here, though many other examples exist).
The problem with all these examples of bijections is that typically the ...
1
vote
0
answers
95
views
1D representation of 2D discrete Fourier transformation [closed]
I'm not too familiar with image processing, so I need a little help:
In general, if we transform a discrete function $f$ with $n$-variables from the "spatial domain" using the Fourier ...
- 11
2
votes
0
answers
137
views
Visualisation of general 3x3 matrices, with applications to the pedagogy of linear algebra?
I've got a method for visualising non-zero $2 \times 2$ real matrices (modulo non-zero scalar factor) using the fact that:
Nonnegative determinant matrices (modulo non-zero scalar factor) are in 1-to-...
- 4,943
0
votes
0
answers
100
views
Possible shifts in finite elementary cellular automata
I investigated the long term behaviour of a pair of black cells ■■ on a circle of $N$ cells under the action of each of Wolfram's rules $R$. For each combination $(R,N)$ I determined the first ...
- 9,720
1
vote
0
answers
376
views
Astonishing affinity of Wolfram's rule 110 to the numbers 2 and 7
I investigated the evolution of a single black cell on 1-dimensional grids with periodic boundary conditions of variable sizes $N$ under Wolfram's rule 110 which is the only one for which Turing ...
- 9,720
0
votes
1
answer
833
views
Plot two implicit surfaces in 3D and highlight their intersection [closed]
I want to plot the two surfaces which are defined in $ \mathbb{ R }^3 \ni ( x, y, z ) $ via the equations $ 0 = y^2 - x*(x^2 + 1) $ and $ 0 = z^2 - y*(y^2 + 1) $, respectively.
Moreover, I want also ...
- 327
9
votes
1
answer
641
views
Aphantasiac mathematicians? [duplicate]
Over the past few years there's been a fair amount of publicity given to the phenomenon of aphantasia, the condition of being unable to form visual images in one's mind or remember what things look ...
0
votes
1
answer
79
views
Visualization PDF of distribution defined by quantiles
How can I visualise PDF of distribution defined by quantiles, that I predict with my neural network? Now I'm passing quantiles to the histogram, but I don't think it is the correct way for visualising....
12
votes
2
answers
849
views
Visualizing holomorphic differentials on a compact Riemann surface?
It is a classical result that the vector space of holomorphic differentials on a compact Riemann surface of genus $g$ has dimension $g$. I am wondering if there is a way of visualizing this wonderful ...
- 82.6k
1
vote
0
answers
58
views
Barycentric coordinates of weighted edges
Given $K_n$ with weighted edges, we can fix an edge $e_{AB}$, iterate over all non-adjacent edges $e_{CD}\in E\setminus e_{AD}$ and record how often $e_{AB}$ was in the lightest, intermediate or ...
- 13.2k
1
vote
0
answers
44
views
Methods for useful visualisations of complete weighted graphs
Question:
which methods for visualising complete weighted and symmetric graphs, i.e. $K_n$, are useful in the sense that they can aid in mathematical research?
The Traveling Salesman Problem may ...
- 13.2k
1
vote
1
answer
49
views
Represent multivariate data [closed]
I am not sure if this is the best place for my question. Please delete if it is not, but I would really appreciate some suggestions.
I want to graphically represent multivariate data. I have 7 ...
- 11
29
votes
2
answers
3k
views
What (or how) are the new spaces of derived algebraic geometry?
I am a beginner in derived algebraic geometry and I am trying to develop some visual and geometrical intuition about derived schemes (and stacks), or more precisely about the new geometrical phenomena ...
- 787
16
votes
2
answers
1k
views
What's the "actual" shape of a black hole accretion disk?
[Warning: I have no expertise in general relativity, so this question might not be very rigorous]
More and more often we come across science popularization articles like this one which show beautiful ...
- 23.3k
8
votes
0
answers
2k
views
Visualization of an algebraic stack
As the visuallization of an algebraic stack is virtually impossible I warn about this is a soft question.
I am interested in thinking visually about algebraic stacks (also higher and derived stacks, ...
- 787
7
votes
1
answer
485
views
Visualizing a Whitehead product: the attaching map $S^3\to S^2\vee S^2$
There are informative and easily accessible images and videos that illustrate the Hopf fibration $S^3\to S^2$ by describing what happens to the fibers in the unit cube $(0,1)^3\approx S^3\backslash \...
- 517
1
vote
0
answers
202
views
Imagining linear maps between finite fields
I can't imagine a right picture of a linear transformation $\mathbb{F}_{p} \mapsto \mathbb{F}_p$ or $\mathbb{F}_{p^2} \rightarrow \mathbb{F}_{p^2}$ etc (over the field $\mathbb{F}_p$) although they ...
- 353
12
votes
0
answers
2k
views
Visualization and new geometry in higher stacks
I am trying to develop a geometrical intuition for "higher spaces", i.e. both in the sense of higher dimensional spaces (more than three dimensions) and in the sense of abstractions beyond ...
- 787
6
votes
3
answers
681
views
When is $2\varphi(n) > n$ – and how to prove it?
When coloring the squares of the Ulam spiral not only by black and white (for being prime or non-prime) but by shades of grey representing the normalized totient function $\varphi(n)/n$
and ...
- 9,720
5
votes
1
answer
503
views
Explaining patterns in modular multiplication graphs
Let the multiplication graph $n/m$ be the graph with $m$ points distributed evenly on a circle and a line between two points $a$, $b$ when $an \equiv b\operatorname{mod} m$.
These graphs often look ...
- 9,720
1
vote
1
answer
378
views
Why is $n_{n^2-1}$ the smallest graph that clearly shows the structure of multiplication by $n$?
Initially, I wanted to ask this question as a puzzle.
Consider a regular $m$-gon. Let $0$ be the lower corner and count the corners clockwise.
Let $n_m$ be the multiplication-by-$n$-graph of $...
- 9,720
7
votes
1
answer
1k
views
How to visualize local complete intersection morphisms?
As the question title asks for, how do others visualize local complete intersection morphisms? My experiment in asking people in real life didn't pan out, so I'm consulting the MO algebraic geometry ...
- 87
12
votes
2
answers
1k
views
How to visualize finiteness of class number?
As the question title asks for, how do others "visualize" the finiteness of class number with algebro-geometric insight? I just think of it as a result in algebraic number theory and not one in ...
3
votes
0
answers
238
views
Visualization of hidden structures in numbers
[Please allow me a note: The way desribed below allows to depict functions $f:X^2 \rightarrow Y$ completely in two dimensions (without hiding or omitting any information). This allows for depicting ...
- 9,720
36
votes
2
answers
3k
views
How to visualize Dirichlet’s unit theorem?
As the question title asks for, how do others "visualize" Dirichlet’s unit theorem? I just think of it as a result in algebraic number theory and not one in algebraic geometry. Bonus points for ...
14
votes
1
answer
2k
views
How to visualize the Frobenius endomorphism?
As the question title asks for, how do others "visualize" the Frobenius endomorphism? I asked some people in real life and they said they didn't know and that I could go and ask on MO and possibly get ...
17
votes
2
answers
648
views
Geometric/combinatorial depiction of algebraic identity?
I'm looking for a geometric or combinatorial depiction of the algebraic identity
$$
xyz = \frac{1}{24} \Big\{(x+y+z)^3 - (x-y+z)^3 - (x+y-z)^3 + (x-y-z)^3 \Big\}.
\label{*}\tag{$*$}
$$
Here is the ...
- 6,237
17
votes
1
answer
1k
views
How to visualize a Witt vector?
As the question title asks for, how do others "visualize" Witt vectors? I just think of them as algebraic creatures. Bonus points for pictures.
1
vote
2
answers
1k
views
Understanding reduced suspension of $S^1$ [closed]
I know this is just $S^2$. To see it, I use the CW structure of $S^1$ x $S^1$ , consisting of one 0-cell, two 1-cells and a 2-cell. Then since the reduced suspension is the cartesian product ...
- 71
5
votes
1
answer
233
views
Is Visualization of Data a Subject of Mathematical Research? [closed]
Please excuse my naive question, but what kind of rôle does the visualization of (especially high-dimensional) data play in mathematical research?
I know, that it plays an important rôle in the ...
- 13.2k
20
votes
4
answers
2k
views
Problems for developing mathematical visualization expertise
Einstein stated that he often explored and reasoned visually and spatially, and only after achieving understanding cast his insights into algebraic form. He could just "see" the answer. There are ...
5
votes
1
answer
2k
views
t-Stochastic Neighbor Embedding vs Topological Data Analysis
The shortest form of this question is:
How much TDA can be done with tSNE?
Specifically, I'm referring to the application of TDA to clustering data, so, think along the lines of Ayasdi's ...
- 4,952
13
votes
2
answers
1k
views
Why does this Moiré pattern look this way?
I was making some gifs of Mobius transformations in Matlab, and some strange patterns began to appear. I'm not sure if a deeper knowledge of the filetype/algorithm is needed to understand this ...
- 397
5
votes
1
answer
454
views
How to visualize a category (of "combinatorial" maps)
This is a practical and very soft question, with the combinatorial database http://www.findstat.org in mind.
I have a few, around 20, families of combinatorial objects, for example Dyck paths, ...
- 5,792
1
vote
0
answers
59
views
Open volumetric time series data set
Does anyone know where I can find a good open volumetric time series data set?
I had a look at some of Stanford's open data sets (https://graphics.stanford.edu/data/voldata/ )
But these do not seem ...
- 191
1
vote
0
answers
226
views
What is the state of the art of visualizing bifurcations for "difficult" dynamical systems?
This question is related to my other recent question on MO (although I am not confident that the dynamical system described in that other question is actually "difficult," in the sense that I will ...
- 709
54
votes
3
answers
3k
views
The view from inside of a mirrored tetrahedron
Suppose you were standing inside a regular tetrahedron $T$ whose
internal face surfaces were perfect mirrors.
Let's assume $T$'s height is $3{\times}$ yours, so that your
eye is roughly at the ...
- 151k
6
votes
1
answer
881
views
How to visualise Bollobas' 1965 theorem?
Theorem
$[n]=\{1,\ldots,n\}$. Let $\lbrace (R_i, S_i), i \in I \rbrace, R_i, S_i \subset [n]$ be such that $R_i \cap S_i = \emptyset, R_i \cap S_j \ne \emptyset (i \ne j)$. Then $$\sum_{i \in I} \frac{...
- 323
282
votes
47
answers
110k
views
Examples of unexpected mathematical images
I try to generate a lot of examples in my research to get a better feel for what I am doing. Sometimes, I generate a plot, or a figure, that really surprises me, and makes my research take an ...
5
votes
2
answers
4k
views
Visualization of the real projective plane [closed]
Consider a closed (compact and without boundary) and non-orientable 2-manifold $M$. By Whitney embedding theorem, one can embed $M$ in $\mathbb{R}^4$. $M$ cannot be embeded in $\mathbb{R}^3$ and just ...
- 1,303
7
votes
4
answers
2k
views
Visualizing functions with a number of independent variables
I need to graph real valued functions (for exposition and analysis).
The issue is: there are more independent variables so that the conventional graphing methods can't be used, and furthermore I don't ...
- 851
4
votes
4
answers
1k
views
Picturing a Certain Torus and Klein Bottle
The other day I was explaining orientability to someone and we were walking through some of the statements about orientability on the Wikipedia page on the topic. While I was able to satisfy his ...
- 5,191
37
votes
4
answers
5k
views
Understanding the countable ordinals up to $\epsilon_{0}$
in a recent MO question, link, discussing the current foundations of mathematics, the author linked a video lecture by Prof. Voevodsky, which argues against the principle of $\epsilon_{0}$-induction ...
user11618
28
votes
12
answers
3k
views
Creating high quality figures of surfaces
I am not sure if this question is suitable for mo, it is more about visualization than math. Anyway, here it is:
What is the best way to visualize a 2-surface in Euclidean space with high quality?
...
19
votes
5
answers
18k
views
Visualization of Riemann–Stieltjes Integrals
The Riemann–Stieltjes integral $\int_a^b f(x)\,dg(x)$ is a generalization of the Riemann integral. It is e.g. heavily used as a starting point for stochastic integration. The approximating Riemann–...
- 5,935
10
votes
5
answers
2k
views
Visual representation of mathematical research interrelationships
I remember seeing a visualization in the form of a 2d (nodal) graph of all areas of academia, with math, physics and engineering over in one section, connecting in an arc to the central area of ...
- 2,383