Page not found – Bitcoin Stack Exchange

Battery Exchange Network

The Stack Exchange network includes 176 question and answer communities, including Stack Overflow, the largest and most reliable online community on which developers can learn, share knowledge and build their careers.

Visit Stack Exchange

The Fujifilm X100F modem? – Stack Exchange Photography

Battery Exchange Network

The Stack Exchange network includes 176 question and answer communities, including Stack Overflow, the largest and most reliable online community on which developers can learn, share knowledge and build their careers.

Visit Stack Exchange

Dungeons & Dragons – Stack Exchange Role Playing Games

Battery Exchange Network

The Stack Exchange network includes 176 question and answer communities, including Stack Overflow, the largest and most reliable online community on which developers can learn, share knowledge and build their careers.

Visit Stack Exchange

Aggegenic geometry – Batteries in the space of research stack modules

I wish to acquire a little practice and better understand the use of batteries in the context of classical module spaces of sheaves. By classic, I mean vaguely a practical description of the geometry of spaces of modules of sheaves in the spirit of work of Drézet-Le Potier and the book of Huybrechts-Lehn. The two major articles that I have read so far and which use stacking techniques are "The irreducibility of vector beam modulus spaces on the surfaces governed by the law" of Walter and Göttsche-Hirschowitz's "Weak Brill-Noether" for vector beams on the projective plane.

Can you recommend more high-quality papers using batteries to prove items about module spaces of sheaves?

MariaDB SPIDER engine – Exchange Stack Database Administrators

I'm trying to include only one table from another MariaDB server (let's call it A) in the database on another server (even physical) (let's call it B). And I came with the conclusion that SPIDER motor could be a good option. But I can not make it work. Here is what I have done so far:

on the server A

  • I've installed the SPIDER engine even though I do not think it's necessary
  • Port 3306 is visible from the outside
  • MariaDB is set to allow connections from anywhere
  • I created a user test_user with host set on %
  • I created the following table in the test database:

    CREATE TABLE sss (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR (50)
    ) MOTOR = InnoDB;

on server B

  • I installed the SPIDER engine
  • I have created the following SERVER:

    CREATE SERVER dataNode1 FOREIGN DATA WRAPPER mysql
    OPTIONS (
    HOST & # 39; IP-server-A & # 39;
    DATABASE & # 39; test & # 39;
    USER & # 39; test_user & # 39;
    PASSWORD & # 39; passwd & # 39;
    PORT 3306);

  • Then I created the table as follows:

    CREATE TABLE sss (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR (50)
    ) MOTOR = Spider
    COMMENT = = wrapper "mysql", srv "dataNode1", table "sss" & # 39 ;;

I manage to connect with test_user of server B at server A:

mysql -h IP-server-A -u test_user -ppasswd

But when I log in with root for MariaDB sure server B and I try to access the table sss, I receive:

No. 1227 - Access denied; you need at least one SUPER privilege for this operation.

What did I miss? Thank you.

Python Libraries for Algorithms – Computer Science Stack Exchange

Thanks for contributing an answer to Computer Science Stack Exchange!

  • Please make sure to respond to the question. Provide details and share your research!

But to avoid

  • Ask for help, clarification, or answer other answers.
  • Make statements based on the opinion; save them with references or personal experience.

Use MathJax to format equations. MathJax reference.

To learn more, read our tips for writing good answers.

SharePoint Online Development / Administration Course – SharePoint Stack Exchange

I am new to SharePoint Online. Are there good courses to follow easily for administrative / development purposes ?.

I've checked in LinkedIn and pluralsight without being able to find any development tutorials.

I am currently stuck on how to customize emails and Web Parts and I do not know where to find the code.

Generic Factory in Typescript – Code Revision Stack Exchange

I am new on typed. I have a class that works with the remaining API and caches the result. Thus, in case of calls to several functions, there will be only one network operation and several searches in the cache.

I have created a demo prototype and I need your feedback. Are there any problems with the code? I may have forgotten something? Ideas to improve?

Person class {
constructor (public read-only name: string, public read age: number) {}

hi (): void {
console.log ("Hello!% s,% d", this.name, this.age);
}
}

Dog class {
constructor (public name read-only: string) {}

give_me_the_pawn (): void {
console.log ("you are here");
}
}

Cache of the export interface {
set (key: string, value: T): void;
get (key: string): T | no;
}

type Factory = () => Cache;

Parameters of the class {
constructor (read-only public createCacheFunc: Factory) {}
}

testFunc function (parameters: Parameters) {
let stringCache = settings.createCacheFunc();
stringCache.set ("person", "test string");

let personCache = settings.createCacheFunc();
let person = new Person ("Paul", 25 years old);
person.hi ();

personCache.set ("person", person);

let dogCache = settings.createCacheFunc();
let dog: dog = new dog ("dog");
dog.give_me_the_pawn ();

dogCache.set ("person", dog);
}

/// use

CacheBasedOnMap class implements the cache {
private card: Card;

constructor () {
this.map = new map();
}

set (key: string, value: T): void {
console.log ("Key inserted -% s", key, value);
this.map.set (key, value);
}

get (key: string): T | no {
if (this.map.has (key)) {
Returns this.map.get (key)!;
} other {
return null;
}
}
}

createCache function(): Hidden {
returns the new CacheBasedOnMap();
}

let s: Settings = new Settings (createCache);
testFunc (s);

Thank you in advance.

c # – Derivative approximation – code revision stack exchange

I am fairly new to programming, but I have a fairly extensive background in mathematics. Because of this, I decided that one of my first programs (in C #) would estimate derivatives. This program does just that, and it only does $ x ^ 2 $. Here is the main part of the code:

    Console.WriteLine ("Number");
doubleval = ConvertToDouble (Console.ReadLine ());
double val2 = val - .000000000001;
double num = Math.Pow (val, 2) - Math.Pow (val2, 2);
double den = val - val2;
double years = num / den;

Now, this provides a very good approximation of $ f (c) $ using the equation of a secant line and a very small change of x, but I would like to get an exact derivative. To do this, I should program the limit concept in my program. How could I do it? Thank you

Canon EOS T7i DSLR – Photo Stack Exchange

No, you should get the 55-250.

55-250 is a goal to reframe. 70-300 is a full frame goal. The full frame lens gives you a slight advantage in terms of focal length, but I would not say that 300mm will allow you to take pictures that 250mm do not give you. 300 mm is only 20% more than 250 mm.

The reason I suggest 55-250 is that 70-300 is optimized for a complete image. For a large model camera, the image quality should be similar to that of 55 to 250 pixels: you will only see benefits in terms of image quality if you use the image circle complete. In addition, the 70-300 because of its large image circle is significantly heavier and much more expensive. You pay for heavy glass that you do not really need. In contrast, the 55-250 circle has an optimized picture circle for a compact camera, so there is no unnecessary glass.

If you really think you need more focal distance and are willing to pay a lot of money, consider a 100-400 lens: Canon, Tamron, etc. unnecessarily heavy on a camera. In addition, the Canon probably far exceeds your budget (which you did not specify, by the way), while the Tamron is significantly cheaper, but still costs several times the price of a 55-250 .

I would go with the 55-250 given your camera potential. It is a very good goal for a very good price and a very good weight. It has its limits, but they mostly come from its picture circle of the size of a crop, and you can not overcome it anyway with a camera.

However, that said, if you take very fast moving animal pictures such as birds, the faster autofocus of 70-300 might present some advantages.

Edit: I repeat the statement that 70-300 has a similar image quality. In reality, he is poorer on a camera! See here for comparison.