This tag is for questions that are asking for online resources in mathematics (references, dictionaries, encyclopaedic collections, online tools, videos an lectures, etc), or asking about the mathematics behind tools and technology found on the internet.

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0answers
11 views

Hadamard matice decomposition to sparce matrices

$H_2=\begin{pmatrix} 1 & 1\\1 & -1 \end{pmatrix}$ and $H_{2n}=H_2\otimes H_n$. I am looking for decomposition of $H_n$ to sparce matrices and its proof. Is there any good source to suggest ? ...
-1
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0answers
33 views

Real Analysis 2/Mathematical Analysis online courses(for credit) [on hold]

This is a long shot but does anyone know any universities(US/UK/Australia) that offer an equivalent to Real Analysis 2 or Math Analysis online; especially for Fall 2015? I would need to get college ...
0
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1answer
34 views

Does a function ( $f(x)$ )is convex iff $f''(x)>0$?

May be it will be a stupid question, but I don't know when a function is convex. My documents from different resources tell me different answers. One of them told that a function (Example $f(x)$) ...
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0answers
14 views

Looking for some good introductory level resources for Gibbs Sampling

In context of a course in bayesian modelling Im following, im looking for some good resources (videos, lecture slides, texts) about Gibbs sampling.
-1
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0answers
12 views

Good broad review of agent-based modeling? [closed]

Trying to find some good review of agent-based models and networks, covering what is called "opinion dynamics", correlated behavior of agents, phase transition analogies, etc. Are there any articles ...
1
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0answers
59 views

Please guide me books and online materials for this course

I have recently taken Course on Numerical Analysis. It is correspondence course. So i to do self study. I will be glad if someone mentions online videos and elementary books which contains following ...
1
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0answers
30 views

Calculus book for computer science students

I'm going to teach calculus I and II to undergraduate computer science students and I would like to know if someone here knows some book or site with easy calculus applications in computer science. ...
2
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0answers
55 views

Find positive integer $x$, $y$, $z$ such that $2x^{2x}-1=y^{z+1}$

Find all positive integer $x$, $y$, $z$ such that $2x^{2x}-1=y^{z+1}$ I have tried to use LTE lemma but it didn't work. I think my problem is $z+1$. I can not control it. When I use LTE lemma, the ...
2
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0answers
37 views

Online publication of short essays

If I have some interesting insight on Twin prime Conjecture, which does not prove or disprove it, but is still worth sharing how do I go about it? It is not an in-depth research so I cant really ...
0
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2answers
53 views

How to learn cryptography [duplicate]

I have just started learning Cryptography.I looked on the Wikipedia and found topics like "Public key Cryptosystem","Symmetric Cryptography" ,"Cryptanalysis" etc. Below this in the reference section ...
4
votes
3answers
116 views

Online materials for self studying introductory abstract algebra

I am interested in trying to self study intro abstract algebra this summer, but I am feeling that just using books may not be the best. I am interested to know if anyone has links to any free lectures ...
0
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0answers
25 views

Looking for resources on these topics from Linear Algebra

I am looking for Characteristic roots and characteristic vectors of a linear transformation or of a matrix, Algebraic and Geometric multiplicity of a characteristic value, Cayley-Hamilton theorem, ...
-3
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3answers
65 views

is there an online tool for solving equation of a line? [closed]

I have as input two points. But the input points contain variables (constant references). I've seen some tools online but they require numeric values. The two given points are specified by constant ...
0
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0answers
40 views

Books for Real analysis similar to or having same essence like Charles Pinter Abstract algebra

I am looking for book which is similar to spirit of pinter's book mentioned in question that is which is suitable for self study and beginners. Can anyone recommend? Thanks
1
vote
1answer
61 views

Does anybody know a good introduction to homology?

Essentially what the title says. I need something that will give me a decent introduction into homology theory. I don't need too deep of an understanding, just enough to get through a paper I'm ...
2
votes
0answers
28 views

A sheet of formulas for practical application of Integration?

does anyone know where I can find an organized formula sheet with formulas of the application of integration (triple and/or double integrals)? Like finding the center of mass of a solid and such. ...
3
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0answers
29 views

Books to help us to draw 3D pictures [duplicate]

I will begin to teach calculus and topology in a college and I would like to know if there are some books or sites which teach us to draw 3D pictures as torus, möbius band, etc. I saw some ...
0
votes
1answer
45 views

Need resources for difficult Algebraic Identites.

Where can I find all the algebraic identities and their proofs of following types, $a^3+b^3+c^3–3abc≡(a+b+c)(a^2+b^2+c^2–ab–bc–ca)$ $a^3+b^3+c^3–3abc≡ \dfrac12 (a+b+c)((a-b)^2+(b-c)^2+(a-c)^2$ ...
8
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1answer
137 views

What are some interesting blogs about general topology?

We have several question asking about book recommendations for general topology - for example the posts linked to Best book for topology? or the posts mentioned in the relevant section of List of ...
2
votes
2answers
29 views

Can the concept of congruence be applied to the remainder of a polynomial division?

I know this is a very simple question, so please I apologize but I am not familiar with it: Can the concept of (modular arithmetic) congruence be applied to the remainder of a polynomial ...
-2
votes
1answer
54 views

Website with possible closed forms of numbers

I encountered a website that had a large number of possible closed forms per a user number entry. It is not WA. I cannot locate it now. I had it saved before having to reinstall my browser. Anyone ...
0
votes
0answers
17 views

Correlation between ordinal variables

I want to know the correlations between 3 groups of variables which are oridinal (rating of 1 to 10). I have followed the formula on wiki and computed the Kendall tau-b correlation coefficients ...
1
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0answers
37 views

Comprehensive easy to understand resource for learning matrix decompositions?

I am working on my thesis which is widely depended on knowledge about matrix decompositions. I have studied linear algebra with the help of YouTube videos, MITOpenCourseWare videos and Prof.Gilbert ...
3
votes
6answers
220 views

Textbooks in Point Set Topology

I am about to begin a self-study project in point-set topology. I am a final year undergraduate. I am looking for suitable resources, I have so far come across Munkres' textbook and would like to find ...
3
votes
1answer
75 views

Search for $C^{*}$ on MathSciNet

I am trying to search on MathSciNet for an article which contains $C^*$ in its title (as in $C^*$-algebras) however I can't figure out how to get MathSciNet not to interpret the '*' as a stand in for ...
5
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3answers
64 views

Any source for this formula?

I have never learned math through English as a medium of instruction, so my English math vocabulary is very poor. My problem: I had some data for different neighborhoods. For example: ...
6
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2answers
90 views

How do theorems arise?

I am reading complex analysis where I have come across Maximum Modulus Principle which states that if an analytic function $f$ assumes its maximum in a point of the domain $S$ then $f$ is constant ...
1
vote
1answer
53 views

Resources on exterior algebra, wedge product, geometric product and tensors

I would like to learn exterior algebra, wedge product and geometric product along with their applications in physics. Is there a good source you can recommend? Should I study differential geometry in ...
6
votes
2answers
86 views

Exploring $ \sum_{n=0}^\infty \frac{n^p}{n!} = B_pe$, particularly $p = 2$.

I was exploring the fact that $$ \sum_{n=0}^\infty \frac{n^p}{n!} = B_pe,$$ where $B_n$ is the $n$th Bell number. I found this result by exploring the series on wolframalpha and looking up the ...
0
votes
1answer
28 views

Conway polyhedra notation calculator?

I recently read about Conway polyhedra notation, and I want to experiment with it. Are there any programs that take the notation, and output a representation of the shape?
0
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2answers
71 views

Online service for completing the square

Is there any online service for completing the square? For example:
0
votes
1answer
20 views

A website that determines whether there is a solution to a set of equations

Does anyone know a website that determines whether there is a solution to a set of equations? For calculus I like to use derivative calculators to see whether my answers are correct and I would to do ...
1
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0answers
20 views

How to know one book whether has an English version?

I want to find the English translation of Vorlesungen über nicht-euklidische Geometrie written by Klein. Thanks.
0
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0answers
68 views

Number of non-isomorphic groups of order $n$

$G$ is a group of order $n=p_1p_2....p_k$ then how to find the number of non-isomorphic groups of order $n$ where $p_i's$ are distinct primes I can find the number of number of non-isomorphic ...
0
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1answer
60 views

Properties of convolutions w.r.t. continuity and partial differentiability

Is there some good summary of properties of convolutions available out there? I'm interested in continuity and partial differentiability topics, like, when exactly do we have $f*g$ is continuous at ...
0
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2answers
78 views

Need to create latex document. [closed]

I am an undergrad and currently doing my first research project. I was wondering if anyone has a recommendation of a good latex software to use. I downloaded TexWorks but I am having a hard time ...
0
votes
1answer
90 views

What are the prerequisites for learning abstract algebra?

Well, I want to learn abstract algebra. So, I get across this http://www.extension.harvard.edu/open-learning-initiative/abstract-algebra. But I'm not sure whether I've understanding of prerequisites ...
0
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0answers
29 views

Video lecture on multivariate analysis?

Preferably covering the second half of Rudin's Principles of Mathematical Analysis. I've been looking for such a course within my university but couldn't find it. Does anyone know of any decent video ...
2
votes
2answers
493 views

Stochastic Processes Solution manuals.

Does anyone have a link or a pdf stash of solution manuals for stochastic processes ebooks? I am doing a self-study on this course and I can't seem to find any solution manual online to cross-check ...
2
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0answers
32 views

How to filter out non-mathematical results in online searching?

This similar question has been asked; yet I am still looking for an efficient way to filter out non-mathematical materials in an online searching. For example, is there any "mathematical" searching ...
0
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2answers
47 views

Quick binomial test for high number of trials

I just wanted to perform a quick binomial test for an experiment (Bernoulli trial) with 185 successes out of 459 trials and a (hypothesized) success probability of 0.2. I do not have any mathematical ...
0
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2answers
40 views

What are some books or online resources about the Sommerfeld-Watson method for series summation?

I'm looking for resource recommendations on the Sommerfeld-Watson summation method, i.e. the use of the residue theorem to obtain expressions like $$ \tag 1 \sum_{n \in \mathbb{Z}} g(n) = - \pi ...
2
votes
1answer
45 views

Online database of formulae for series, infinite products, limits, ecc.

Around the site there are a lot of questions about closed form expressions or approximations for specific series, products, limits and whatnot. These however are hard to find to the difficulty in ...
1
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0answers
41 views

Where can I find these definitions in algebraic curves?

I'm trying to understand the definitions of trigonal curve, ramification points and linear systems. What is the best place to find it? I have as background just Fulton's algebraic curves. Thanks
0
votes
1answer
66 views

What is ${\cal D}(\Omega_0)\otimes{\cal D}(\Omega_1)$?

How exactly can I prove that ${\cal D}(\Omega_0)\otimes{\cal D}(\Omega_1)$ equals the linear space $M$ spanned by 'simple fucntions' $\phi\in{\cal D}(\Omega_0\times\Omega_1)$ of the form ...
1
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0answers
21 views

Composition of smooth functions is smooth

Is there any book / online resource where this proof is carried out in the context of Banach spaces and Frechet derivatives?
3
votes
1answer
240 views

Online tools for checking validity of classical, intuitionistic, … logic formulas?

What online tools are available, where one can enter a formula of (first order) propositional or predicate logic, and have it check whether it is valid classically, intuitionistically, or even ...
2
votes
2answers
128 views

Is there a math website to study math from a mathematician point of view (ie proof oriented?)

I´m a student of the University of Puebla, Mexico, and I think that we lack of exigence there so I want to study math on internet to improve my education. I have already looked sites like edX, but I ...
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0answers
40 views

Differentiation through the integral sign, more general case

I wondered in which cases, given a measurable space $(A,\mu)$, Banach spaces $E,F$, an open $U\subseteq E$ and $f:A\times U\rightarrow F$, we can conclude that the function $s\mapsto\int_A f(x,y)dx$ ...
1
vote
1answer
58 views

Online resources for Mathematical Modeling

I'm taking mathematical modeling this semester in college and usually there are resources online to read examples and see another point of view but I'm not able to find it for this class. Can anyone ...