For questions seeking recommendations for online mathematics resources that are useful at a research level.

**3**

votes

**0**answers

123 views

### Eigenvectors of sum of SO(3) matrices

I asked this question before on MSE but go no answers. It seems that the problem is rather difficult so I thought of trying here. Given two matrices $A,B\in SO(n)$, each describing a rotation by ...

**8**

votes

**2**answers

663 views

### The Stacks project

I have a question concerning the admirable Stacks Project.
Which comparable projects are there:
approach-wise: "an open source textbook on algebraic stacks and the algebraic geometry that ...

**35**

votes

**2**answers

3k views

### ICM 2018 lecture videos

Is there a place to watch ICM 2018 plenary lectures (and other lectures if possible)?
Here is the official Youtube channel of the ICM but they don't seem to be posting the lectures.
https://www....

**2**

votes

**0**answers

44 views

### Resource request: Moyal $\star$-product based calculations

I already asked two questions about the Moyal $\star$-product here and here but I think I'll have a lot more similar questions, so I'm wondering if anyone can help me with finding some good resources.
...

**29**

votes

**2**answers

1k views

### Is it possible to cite a page in n-Lab in a research paper?

One of the concepts I need in my paper is best summarized on the n-Lab page. I tried my best to find a similar description of the same concept in a more "classical" reference, such as a paper or a ...

**8**

votes

**2**answers

1k views

### Collection of Mathematical Constants

I recently stumbled over the large collection of mathematical constants of Mauro Fiorentini; it is in Italian and appears to be something in the vein of the famous OEIS, however maintained by a single ...

**9**

votes

**0**answers

882 views

### Can the Math 2.0 Forum's Closure be prevented? [closed]

Apologies if this is not regarded as suitable for MO, but I have noticed other "soft" questions and feel this deserves some attention by the community, and did not know where else this could be asked.
...

**15**

votes

**1**answer

778 views

### LMS Lectures on Geometric Langlands

Everybody knows how insightful are David Ben-Zvi talks (and comments/answers here on mathoverflow). I was trying to watch the LMS 2007 Lecture Series on Geometric Langlands by David, supposedly made ...

**2**

votes

**2**answers

186 views

### Resources on Elliptic Boundary Value Problems on manifolds

My situation:
I am currently trying to understand Uhlenbecks results on the Yang Mills equation. One of the most common notions in this paper is that of an elliptic system or an elliptic boundary ...

**11**

votes

**2**answers

446 views

### Examples of (Git) open math (texts) projects

I am an active part of a research project on the positive effects of open math projects on the community. With open math projects I have in mind a particular thing, namely a GIT project on mathematics ...

**9**

votes

**3**answers

586 views

### Web interface for GAP (or other computer algebra system dealing with finite groups)?

GAP is computer algebra system which allows to make calculations with finite groups. (See wikipedia link for an example).
Is there web interface for it ? (I cannot google it.)
Or may be some other ...

**3**

votes

**2**answers

152 views

### What is known about the PDFs for the $\ell^2$-norm of these multivariate distributions?

I'm looking for resources giving the PDFs for the $\ell^2$-norm of various spherically symmetric, continuous multivariate distributions.
For instance, the PDF for the $\ell^2$-norm of a multivariate ...

**84**

votes

**5**answers

5k views

### Is there a database for tracking the dependencies of mathematical theorems?

Given a proof for a result, one could denote the proof as a node on a graph, and then draw arrows to the node from axioms and previous results that the proof uses, and then draw arrows from the node ...

**5**

votes

**1**answer

230 views

### A centralised website for computational attempts in graph theory and metric geometry?

The set of questions below stems from this question.
1) does a website exist that contains (at least links to) code and data files, with the aim to centralise computational results in graph theory ...

**1**

vote

**1**answer

332 views

### Best way to find recent papers in a special field of mathematics?

My subjects of interest are Geometry of Banach spaces, renorming theory and fixed point theory. When I want to find recent papers in these fields of mathematics, mostly, I search name of paper, say, ...

**10**

votes

**2**answers

507 views

### “Database” of simplicial polytopes/spheres

Reading through various papers on polytopes I have come across really interesting examples of simplical polytopes and non-shellable (or non-PL) simplicial spheres but sometimes it is hard to keep ...

**17**

votes

**10**answers

1k views

### Combinatorial Databases

At one point, I remember being excited by seeing the website Encyclopedia of Combinatorial Structures as an extension of Sloane's Online Integer Sequence Database site. Unfortunately, the site (ECS) ...

**22**

votes

**3**answers

793 views

### Which tools can identify scholarly papers that use the same types of equations?

Many types of equations are being used in multiple contexts, so a search for specific formulas might be one way to identify scholarly papers that are conceptually related.
Is any website or tool ...

**1**

vote

**0**answers

154 views

### Database of non-isomorphic trees

As there are several free prime number databases, is there something similar for non-isomorphic trees?

**3**

votes

**1**answer

281 views

### A database on Maass forms?

Is there somewhere a database on Maass forms that includes eigenvalues, Taylor coefficients, etc...?
I am mainly interested in classical forms on $\Gamma(1)\backslash H$.

**8**

votes

**2**answers

471 views

### Where to find digitized old papers on the internet?

Following Murphy's law for the published material:
"The paper you need is too old to be in the arXiv, it is not in any online database which your institution has subscription to, and... it not even in ...

**21**

votes

**6**answers

1k views

### Online high quality colloquium talks

In my department we're thinking about showing online lectures one day per week at lunch, as sort of a virtual colloquium appropriate to mathematics undergraduates as well as faculty. To start with we'...

**4**

votes

**2**answers

212 views

### Databases for sequences indexed by partitions

Is there a database for sequences indexed by partitions similar to Sloane's OEIS? I mean, I am aware that in the OEIS there are some arrays indexed by partitions, but I feel as though most of such ...

**22**

votes

**2**answers

771 views

### Is there a database somewhere for sharing translations of mathematical works?

When doing my language exams for my doctorate, I requested to translate articles relevant to my interests that had not previously been translated, and to be able to do them at home, with the agreement ...

**26**

votes

**6**answers

5k views

### Where to find Asterisque online?

Is there a place online where one can download papers that have appeared in the Asterisque if "your institution subscribes"? I am especially interested in back issues: Asterisque series published a ...

**4**

votes

**0**answers

1k views

### Online Number Theory Video?

Are there any graduate level number theory course available on line ? The only video series I am aware of are some MSRI videos, and Ted Chinburg's courses http://www.math.upenn.edu/~ted/noframes.html, ...

**15**

votes

**5**answers

1k views

### Permission to use Online Notes

I am a new professor in Mathematics and I am running an independent study on Diophantine equations with a student of mine. Online I have found a wealth of very helpful expository notes written by ...

**49**

votes

**10**answers

15k views

### Video lectures for Algebraic Geometry

Are there any good video lectures for studying Algebraic geometry?

**70**

votes

**25**answers

6k views

### What could be some potentially useful mathematical databases?

This is a soft question but it's not meant as a big-list question. I have recently been asked whether I want to provide feedback at the pre-beta stage on a forthcoming website that will provide a ...

**322**

votes

**75**answers

113k views

### Video lectures of mathematics courses available online for free

It can be difficult to learn mathematics on your own from textbooks, and I often wish universities videotaped their mathematics courses and distributed them for free online. Fortunately, some ...

**11**

votes

**4**answers

2k views

### Online introduction to Lattice Theory?

Apart from J. B Nation's (revised) Notes on Lattice Theory, is there any other (mostly introductory) material on Lattices available online?

**7**

votes

**3**answers

598 views

### Is there a list of all connected T_0-spaces with 5 points?

Is there some place (on the internet or elsewhere) where I can find the number and preferably a list of all (isomorphism classes of) finite connected $T_0$-spaces with, say, 5 points?
In know that a $...

**29**

votes

**6**answers

1k views

### Link Repository of International Dissertations

This question (cry for help?) grew out of Colin Tan's question: does anyone have a copy of schmid’s effective work on hilbert 17th? which was a request for a copy of an Habilitationsschrift.
We've ...

**57**

votes

**9**answers

6k views

### Has anyone thought about creating a formal proof wiki with verifier?

Mathematics has undergone some rather nice developments recently with the adoption of new techologies, things like on-line journals, the arXiv, this website, etc. I imagine there must be many further ...

**4**

votes

**1**answer

692 views

### Knot database including text names

Knots such as the 3_1 knot and the 4_1 knot are often referred to as the trefoil and figure-eight knots respectively. There are more obscure names for some of the later ones in the knot tables, for ...

**12**

votes

**8**answers

2k views

### Where on the internet I can find database of graphs?

I am studying graph algorithms.
I need database of graphs on which I can test my algorithms.
Where can I find reliable database of graphs of all kinds?
Thanks!

**12**

votes

**3**answers

875 views

### Database of finite presentations of used groups

Do You know any kind of database of presentations of groups?
It may be on-line or off-line in form of tables, ideally case would be integrated in some Computer Algebra System. I am interested the ...

**123**

votes

**15**answers

15k views

### Is a free alternative to MathSciNet possible?

How could a free (i.e. free content) alternative for MathSciNet and Zentralblatt be created?
Comments
Some mathematicians have stopped writing reviews for MathSciNet because they feel their output ...

**11**

votes

**6**answers

1k views

### Database of polyhedra

As part of many hobbies (origami, sculpting, construction toys) I often find myself building polyhedra from regular polygons. I am intimately familiar with all of the Archimedean and Platonic solids, ...

**22**

votes

**5**answers

2k views

### Errata database?

Some authors do a really great job by collecting errors and comments to their books and putting a list on their websites. I wonder if there is some (perhaps wiki-style) website where errata are ...

**29**

votes

**11**answers

25k views

### Mathematical podcasts/audio

Just to ask if anyone is aware of any interesting math podcasts? I am particularly interested in podcasts describing mathematics in the wider world; but interesting academic podcasts would also be ...

**111**

votes

**71**answers

17k views

### Most helpful math resources on the web

What are really helpful math resources out there on the web?
Please don't only post a link but a short description of what it does and why it is helpful.
Please only one resource per answer and let ...

**153**

votes

**76**answers

55k views

### Best online mathematics videos?

I know of two good mathematics videos available online, namely:
Sphere inside out (part I and part II)
Moebius transformation revealed
Do you know of any other good math videos? Share.