Spyke
xthexderreply
l.sw0.com

Wait... that's not an approximation at all! That equals exactly pi. If I understand the math correctly, it's effectively a formula for the area of a unit circle.

74
lemmy.world

That should be an approximation. To get exactly pi the range of both integrals should be from minus infinity to infinity like this. It's the integral of the 2D Gaussian, which is fairly known.

66
kata1ystreply
sh.itjust.works

And because it always bears repeating;

According to JPL’s Chief Engineer for Mission Operations and Science, Marc Rayman-

Let's go to the largest size there is: the known universe. The radius of the universe is about 46 billion light years. Now let me ask (and answer!) a different question: How many digits of pi would we need to calculate the circumference of a circle with a radius of 46 billion light years to an accuracy equal to the diameter of a hydrogen atom, the simplest atom? It turns out that 37 decimal places (38 digits, including the number 3 to the left of the decimal point) would be quite sufficient.

42

Technically you need another 20 digits if you want to get down to a Planck length. (57 digits in total)

15
daqureply
feddit.org

So the number 3 should be close enough for home use. Good to know. Thanks!

8

You can quote with the “greater than” sign (>). Backticks mark text as source code.

> quote

1
xthexderreply
l.sw0.com

Ah, you're right. I was thrown off by WolframAlpha saying the integral = π ≈ 3.1416 Both of those should be ≈

(x^2 + y^2)=1 is the equation for a unit circle, so it's definitely related. Just not quite how I thought.

21

Also the 2D gaussian integral is used to give an insight on why the 1D gaussian integral is sqrt of pi. Here is a video with cool visualization for anyone interested.

8
lemm.ee

it ends in deeedee so maybe this is dexter when his sister has used the mosquito-izer on him and he's angrily yelling at her

28

For some reason in my head, "eeeeeeeeeeeee de eee de e" is the sounds a toddler makes when you take them to a play ground and they just start to run in wide arcs - unable to decide which piece of equipment to play on first.

So, of course, the integral of "eeeeeeeeeeeee de eee de e" would be the sound of them sleeping the car on the way home.

12

You may just have made me create pattern screamer and I don't exactly think it's happy at you.

9

Is nobody going to complain this is a screenshot of a Tumblr post of a Reddit post

8
lemmy.ca

But what does it sound like as musical notes?

6
A_Areply
lemmy.world

Could be the right hand side or the left hand side of an equation* or of an inequation** whatever.
(*) equations have "=" in middle
(**) inequations have "=<" (or ...) in middle.

4

You reached the end