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Linux Mastering Development

Why is Linux Kernel 5.6 labelled both as Stable and Mainline?

I am confused by this from https://www.kernel.org/ Why is 5.6 called the “Latest Stable Kernel”, while also being mentioned as a Mainline kernel ? Which is it ? In the text 5.5 is mentioned as Stable. Why the two conflicting information ?

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Linux Mastering Development

NGINX RTMP not working with sites-enabled directory set

I’m having problems getting NGINX with the RTMP module to start when the RTMP server block is used within a file inside the sites-available (symbolic linked to sites-enabled). NGINX configuration files are all located at /etc/nginx/. If I use the below RTMP server block directly in the nginx.conf, the server starts up perfectly fine. However, […]

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Linux Mastering Development

Linux Mint: One user having graphics issues, no other users affected

I have a multi-user Linux Mint machine running Cinnammon that is having a really strange graphics issue with regards to one user only, which I have not been able to find an answer to in scouring Stack sites, Mint forums, or the internet in general. The issue is that one user seems to be stuck […]

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Ask Mathematics

Is this sequence $x_n=(1-\frac12)^{(\frac12-\frac13)^{…^{(\frac{1}{n}-\frac{1}{n+1})}}}$ uniformly distributed modulo 1?

The sequence $(x_n) ,n=1,2,\cdots $ is uniformly distributed mod 1 iff for real -valued continious function $f$ defined on the closed interval $[0,1]$ we have $ \lim_{N\to \infty} \frac1N \sum_{n=1}^{N} f(\{x_n\})=\int_{0}^{1} f(x) dx$, Really am not able to apply that theorem for the following sequence $x_n=(1-\frac12)^{(\frac12-\frac13)^{…^{(\frac{1}{n}-\frac{1}{n+1})}}}$ to know if it is uniformly distributed or not […]

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Ask Mathematics

Involution in a commutative unital real C* algebra

It follows immediately from Gelfand duality that the involution in a commutative unital real C* algebra is the identity. Is there a direct proof from the axioms of C* algebras?

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Mastering Development

How to highlight Sudoku box where the element is selected?

So, I have a sudoku generator, when accessing through API, it generates a Sudoku board (JSON array) which then with AngularJS and ng-repeat in a tabled I am displaying the Sudoku board on the page. So far, this is what I have. What I want to achieve is to highlight all the elements that are […]

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Mastering Development

php – Is using a UUID in a newsletter unsubscribe link, secure enough?

I’m working on a php newsletter script. I’ve got a MySQL table of subscribers where each user has a UUID assigned and wondered if using it in the unsubscribe link would be secure enough. I build it by replacing the href attribute together with the query and the UUID that matches the user’s email: // […]

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Mastering Development

Java – dynamically implement interface

I’m refactoring a code which lazy loads a class though the thread’s classLoader like this: Thread.currentThread().getContextClassLoader().loadClass(“path.to.class”); The problem is that “path.to.class” implements an interface (“Log”) from a library that is selected by the App’s user (so I know the driver version at runtime, not compile-time; specifically the driver is mysql-connector-java). So I need a way […]

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Mastering Development

Prevent from SQL Injection – PHP Mysqli [duplicate]

I want to improve my code from SQL Injection Attacks. But I have a small problem. I want on a Login page to prevent attacks. So my users need to enter their email and password. My password is md5 stored in DB. My db connection: <?php $con = mysqli_connect(“localhost”,”root”,””,”test”); ?> Code I want to improve […]

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Mastering Development

what’s wrong with this for loop? weird error [duplicate]

I was learning about for loops and whenever I do this loop String[] fruits = {“Apple”, “Banana”, “Orange”}; for (int k = fruits.length;k > 0; k–) { System.out.println(fruits[k]); } and I get this error Exception in thread “main” java.lang.ArrayIndexOutOfBoundsException: 3 at helloworld.HelloWorld.main(HelloWorld.java:439) Java Result: 1 BUILD SUCCESSFUL (total time: 10 seconds) and I don’t want […]