What is a good preparation for mathematical studies for someone who hasn’t done mathematics in recent years?

To put it simple, I’d like ask for books and other material that I could use to hone my mathematics skills, in preparation for a course at my local university. It’s been a while since I’ve had to use mathematics, so a refresher would be no luxury. Because I was enrolled in a computer science course several years ago, I do have some experience, but I’d really like to fill the gaps that have grown in my knowledge and be as prepared as I can be.

Any references are much appreciated!

Some related questions:

  • Second year mathematics textbook recommendations.
  • Are older mathematics textbooks still “valid”?

Does anyone had done a custom ROM installation in Swipe Elite Devices?

I want to build a custom ROM very specific to my needs. I want to build a ROM for Android having characteristics like Lubuntu from Linux distributions. I should be able to control as much of kernel as I can. I can code in Assembly and C. Are these sufficient for my requirement? I know I should have gone for the XDAforums. I had done that but the jargons were too much for me. I also had contacted my friend who is an expert on installing ROMs. But he isn’t a developer that’s why he can help me with tools but not designing a ROM!

What is this peripheral haziness on a lens element? What can be done about it?

The rear element of a lens has some peripheral haziness on the front surface (inaccessible when the lens is fully assembled). Based on lens diagrams, I believe it is between the two rear elements, but I cannot figure out how to separate them from the housing.

What is the likely cause of the haziness? Since the haziness is peripheral and on the rear element, what effect is this likely to have on images? If I cannot separate the elements, can anything be done to clear it up?

peripheral haziness

What can be done before Content Database is connected?

Soon we’ll be grading our SharePoint environment in an overnight upgrade… I’m currently prepping our servers to make the transition as painless as possible, but what sort of configuration can be completed prior to importing the content database? Currently we’ve only got the default SharePoint_Config database for Central Admin ready.

The things I’ve got left that I’m not sure on are:

  • Configuring Service Applications / services on the servers
  • Configuring outbound email
  • Adding farm solutions
  • Add other general applications (ie SPD, Infopath, etc)

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by: FutuureDomain
Created: —
Category: Link Development
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Bug bounties – Reported a bug to a company nothing as been done [duplicate]

This question already has an answer here:

  • Where to publicly report a vulnerability, after developer ignores it? [duplicate] 4 answers

I’ve discovered a bug in an order page from big American company in April 2017.

I’ve reported the bug to said company and they haven’t done a thing, I email them from time to time but the bug is still there and they haven’t done nothing related to the bounty.

What should I do? Report the bug publicly or wait? They keep replying that the bug is being remediated for the last 9 months.

Thanks in advance.

How is the mapping done from …/script.php?one,1 to …/script/one/2?

There is a PHP script which evaluates one or two parameters via QUERY_STRING. This script should process the parameters via QUERY_PATH. The PHP file type should be omitted.

Request of the form https://example.org/script.php?bla,1 should be converted to https://example.org/script/bla/1.

I think the first part can be accomplished by using

RewriteCond %{REQUEST_URI} ^/script\.php$   RewriteCond %{QUERY_STRING} ^(\w+)(?:,(\w+))?$   RewriteRule .* /script/%1/%2? [R=301,L] 

What must be done so that the script without file extension processes the forwarded request? I’ve tried Multiviews and ForceType – but to no avail.

It is an Apache installation version 2.4. The PHP interpreter runs in CGI mode. There is only access to the .htaccess configuration.

How state updates to existing instances/sessions are generally done?

This is a very broad question, but maybe someone has a worthwhile response.

There is a general synchronization issue that often has to be solved, but always seems to be difficult. Here’s an example:

I was working on a remote system and had an ssh-connection and a remote desktop open at the same time for some reason. I happened to create a file on the desktop in shell, and of course it also appeared on the remote desktop view.

For this to happen one of two things must take place:

1) the desktop session must be constantly polling the filesystem for changes. Costly, ugly, and of course unlikely.

2) The system knows that this change made by the ssh-session requires action on the remote desktop side, and updates the view. This is neat and elegant in a sense, but maintaining an accurate capability to decide when any action performed by any process in the system should cause this update is horrendously complex.

In this case the culprit is the linux kernel (or Desktop environment?) and I presume what it does is the option 2). It’s also very common to encounter small bugs and issues that are clearly the result of this kind of issue not being taken care of.

This kind of a problem where any of multiple changes to a common resource can have an effect on other instances, but determining when is very tedious pops up in many places. Is there a general approach to this? Do we form separate trackers that know how the instance is sensitive to changes and that object can be interrogated? Does every change to the resource (filesystem in this case) include a stage of making sure this kind of stuff takes place? If so, that too must compound to be a massive ordeal. Does someone happen to know how linux handles this specific example case?