davad

u/davad@lemmy.world
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That's probably accurate, but I'm no mathematician. Specifically if you confine yourself to the set of real numbers, it's undefined.

If you confine yourself to the set of rational numbers, integers, or natural numbers, you could get a bunch more undefined equations. For example, if you're only working with the set of natural numbers, sqrt(4) is defined, but sqrt(5) through sqrt(8) are undefined because there are no whole numbers between 2 and 3 (2^2 and 3^2). Similarly, sqrt(-1) is undefined in this case because -1 isn't part of the set of natural numbers, so any expression you used a negative number in would be undefined.

A more intuitive example might be to try using a non-number in an expression. Sqrt(🐱) is undefined. And 🦆-🦢 is also undefined. The operators aren't defined to include cats or birds.

I've always thought "imaginary" vs "real" was an unfortunate naming convention.

I don't know about other fields, but electrical engineering uses imaginary numbers with AC circuits and changing electrical fields. Since electricity moves as waves, imaginary numbers let you represent what's coming 90 degrees later in a compact way.

-1/0 = Boom

But more literally, the answer is undefined.

Instead of thinking of division as a "proper" operator, think of it as shorthand for "x0 = -1". Since the multiplication operator already defines "x0 => 0" and "-1 != 0", there literally is no answer by definition. So "undefined".

For "0/0", it's a little different. Since "x*0 => 0", literally every number satisfies "0/0". Since we're expecting a single number as the answer, we call the answer to this "undefined" too.

Sure, but that's not the situation in the article. These are publicly owned/contracted surveillance cameras that are used to track the movement of residents. And the fig leaf the department is using is to say "the cameras don't track people" because that's just something that Flock does later....with data from the cameras.

on *Permanently Deleted* · c/privacy · 8 pts · 6d

If the company has no legal presence in the country, that probably holds. But if Facebook is collecting ad revenue from anyone in the UK, they've got to have a legal presence there.

This isn't a direct answer, but from your other comments, I think it's useful advice.

Talk to a therapist about this. If you don't have one, find one. You sound unhappy in your relationship. Sometimes that's strictly a relationship problem, but often there's personal work that needs to be done. Doing that personal work might help you be happy in your current relationship or it might help you leave that relationship and transition to something better.

on HPC system setup · c/linux · 4 pts · 13d

I'm not sure how Ansible made it on your list. Ansible lets you apply configuration and ensure applications are installed on groups of machines. It works across a variety of Linux distros.