The h Bar

2:54 AM

@BalarkaSen This book gives a new meaning to terse: "Since $\Lambda^*\Bbb R=\Bbb R\oplus \Bbb R$, it follows that if $e_1,e_2,\dotsc$ form a basis of $V$, then the products $e_\lambda=e_{\lambda(1)}\wedge\cdots\wedge e_{\lambda(m)}$ corresponding to all inc. $m$ termed sequences $\lambda$ form a basis of $\Lambda^mV$." What?

skullpatrol

What was your old meaning of "terse?"

0celóñe7

@skullpatrol It's a saying

skullpatrol

I know, I'm joking.

> ::back to watching football::

0celóñe7

::sips Maker's Mark::

@BalarkaSen this is awful

0celóñe7

3:26 AM

@BalarkaSen I mean for finite dimensional ones, I guess you need $V=\Bbb R\oplus \cdots\oplus\Bbb R$ and then some combinatorics/induction, but for infinite dimensional ones...

0celóñe7

4:31 AM

@JohnRennie Oh man, the irony is too sweet

My CPU overclocker is using more CPU power than it gives

John Rennie

:-)

0celóñe7

@JohnRennie Did you see my messages about my SSD?

John Rennie

Yes. The best solution is to ban you from running benchmark software :-)

The Raiders of Las Vegas

Did you read Gowers' web blog, sir?

0celóñe7

4:48 AM

@JohnRennie Also it turns out that overclocking your CPU in the middle of playing a game is catastrophic

who knew

I'm running a powerful GPU overclock though.

420 MHz

Bernardo has dared me to get 470 stable

John Rennie

@TheRaidersofLasVegas Me? If so, no, Gowers is a mathematician not a physicist and his blog is far beyond me.

The Raiders of Las Vegas

It was about the monopoly of the publishing companies.

John Rennie

Ah, OK, yes I had seen that.

0celóñe7

5:16 AM

@JohnRennie So if 3200 MB/s is advertised and I get 1500, that's not an issue?

Especially if I got 3250 yesterday?

Mikhail

Somebody talking about IO?

Balarka Sen

5:57 AM

@0celóñe7 Not the world's most beautiful exposition on the exterior algebra.

The Raiders of Las Vegas

6:37 AM

What is the most beautiful exposition of elementary algebra that you've seen? @BalarkaSen

John Rennie

7:10 AM

@Nik: hi :-)

Nik

John Rennie

In your system the water levels will always be the same on both sides.

Nik

thanks John...

John Rennie

So the levels will rise until they reach the top of tank B, i.e. tank B is full, while tank A is still only half full.

Well, this assumes you fill the tanks slowly.

Suppose you pour water into tank A faster than the water can flow along the pipe to tank B.

In that case it would be possible to temporarily fill tank A first. But obviously if you sit back and wait the water levels will equalise.

Nik

yup.. understood!

John Rennie

7:20 AM

@Nik sorry for closing your question but we have very strict rules about anything that looks like a homework problem even if it wasn't actually set as homework. We have to do this otherwise we'd be swamped by students trying to cheat on their course work!

But we're happy to discuss things like this in the chat room and there's usually someone around willing to help.

djsmiley2k

Water is a fun one.... non compressible...

I used to work for a water company, controlling pumps and res's and such

When you're controlling some pumps that move 800l/s you've got to think about where that water is going ;)

(4x)

Physics Meta

8:03 AM

-1

Q: Where i can found info about next international meetings in General Relativity

I looking for Events or International Meetings dates in the period September 2017-August 2018. Meetings focused on General relativity, Gravity Waves and Cosmology. Someone knows where i can check this issue. I apologize if this topic is forbidden here, I have not seen the rules in depth Thank...

discussion

AccidentalFourierTransform

9:49 AM

since ACM left this chat is dead

ACM PLEASE COME BACK

skullpatrol

2 days ago, by ACuriousMind

@0celóñe7 I'm in Wacken, expect to see little of me here until Sunday

AccidentalFourierTransform

any $g\in L^p$ defines a tempered distribution, right? as in, $f\mapsto \int f(x)g(x)<\infty$

0celóñe7

11:41 AM

@AccidentalFourierTransform Sure, use Holder.

@AccidentalFourierTransform the map L^p --> S' is even continuous.

@BalarkaSen Do you know how what he claims follows from what he says?

AccidentalFourierTransform

12:22 PM

@0celóñe7 well that was easy

:-P

thx

Gautham Shankar

Hi all,

AccidentalFourierTransform

hallo

Gautham Shankar

Are we allowed to post doubts here on chat box?

AccidentalFourierTransform

you just did

Gautham Shankar

Physics related doubts,I mean. ☺

AccidentalFourierTransform

12:26 PM

:D

yes, yes you can

but there is no one online rn who knows a thing about physics

Gautham Shankar

It is given in my text that a loop (made up of a flexible wire) of irregular shape carrying current located in an external magnetic field changes it's shape to that of a circle in order to maximise the magnetic Flux. But I am having doubts on why actually the Flux needs to be maximized. Can anyone make it clear?

Secret

@dmckee Interestingly, what really attracted me the most about this is the small size of their instrument. I wonder if other particles can have such small sized detectors, or will it be only limited to weakly interacting particles...

0celóñe7

@ACuriousMind I can't believe you

What a horrible person who disappears for a week and deprives me of sending them cat pictures

@ACuriousMind He is walking in front of me right now!!

AccidentalFourierTransform

@GauthamShankar see e.g. physics.stackexchange.com/questions/239591/…

Secret

nature.com/nature/journal/v548/n7665/full/nature23446.html

Figure 3 seemed weird, near the end, the two peaks shifted to the left slightly, not sure if real or instrument noise

and pretty pictures of a stormy Neptune

AccidentalFourierTransform

12:45 PM

that looks like a baby ultrasound

u preggo?

Balarka Sen

The electromagnetic field continues to feel weird.

Gautham Shankar

@AccidentalFourierTransform thanks!

AccidentalFourierTransform

If the electromagnetic field continues to feel weird after four hours, call a doctor.

0celóñe7

@AccidentalFourierTransform why are you obsessed?

AccidentalFourierTransform

i am not u r

Secret

1:02 PM

Drew me the more beautiful feymann diagram that makes no sense

Secret

1:12 PM

0

Q: the way space-time deforms

It seems spacetime is not bending but instead deforming into itself. In an illustration with a 2D universe, space is not deforming like this : which would require a 3rd dimension, but rather more ore less like this : If that's right, then how could a wormhole not make intersections along th...

general-relativity gravity spacetime wormholes

O, and this question helped debunked one of my thoughts about intrinsic curvature, turns out plotting wormholes with that model will be a counterexample

So that means, spacetime curvature is actually pretty abstract...

AccidentalFourierTransform

1:23 PM

AccidentalFourierTransform

1:34 PM

Liberalism is anti science — John Jul 30 at 3:34

in case you guys didnt know

Gautham Shankar

Will a magnet deflect if kept under electric supply lines ??

0celóñe7

@AccidentalFourierTransform correct

AccidentalFourierTransform

shut up you dont even know what liberalism means

america is so weird

you dont know what words mean

Modern liberalism in the United States

Modern American liberalism is the dominant version of liberalism in the United States. It is characterized by social liberalism, and combines ideas of civil liberty and equality with support for social justice and a mixed economy. The term "modern liberalism" in this article refers only to the United States. In a global context, this philosophy is usually referred to as social liberalism. The American modern liberal philosophy strongly endorses public spending on programs such as education, health care, and welfare. Important social issues today include addressing inequality, voting rights for...

Secret

1:56 PM

[List of path integrals that probably make no sense]

AccidentalFourierTransform

[all of em]

Secret

\begin{align}
\int F(f)d[f] = 1 (\text{Definition of probability distribution})\\
\langle f\rangle = \int F(f)fd[f]\\
\langle f \rangle=\sum_{i=1}^N F(i)f_i\\
\langle f\rangle =\int F(f)fd[f] = (\int g(x)dx)(f)\\
\langle f\rangle = \int F(f)fd[f] = \int e^{T}fd[f]
\end{align}

AccidentalFourierTransform

Jul 21 at 19:57, by AccidentalFourierTransform

$[d\phi],\mathscr D \phi,\dots$ is just stupid notation

Secret

line 3 is when the probability distribution is discrete and finite
line 4 is when it is some integrable function $g$ and the set of f is given by $g*f$
line 5 is when the set of f is given by applying a continuous transformation to f

0celóñe7

What should the notation be @AccidentalFourierTransform

Ideally one never deals in such poorly defined concepts though

AccidentalFourierTransform

2:01 PM

$\mathrm d\phi$

Secret

If these are not path integrals (since the integration variable is clearly a function), then treat them as probability distribution over a continuum of random variables

and almost forgot: $F: L^2(\Bbb{R}) \mapsto [0,1]$ is a probability distribution whoose random variable are integrable functions

0celóñe7

You never ever want to work on L^2

Use a Sobolev or Lipschitz space

Secret

Is there a symbol for the space of all (Lesbegue) integrable functions?

0celóñe7

@AccidentalFourierTransform why not a capital D

@Secret L^1

Anonymous

@GauthamShankar It might if it is not already aligned with the magnetic field.

Secret

2:06 PM

but yeah, I think I will stick to Sobolev or Lipschitz now, cause $L^1$ might have issues

AccidentalFourierTransform

@0celóñe7 bc thats a derivative dummy

0celóñe7

@AccidentalFourierTransform and d isn't?

AccidentalFourierTransform

¯\_(ツ)_/¯

0celóñe7

Where the hell is @ACuriousMind

Secret

He is in Wacken

4 hours ago, by skullpatrol

2 days ago, by ACuriousMind

@0celóñe7 I'm in Wacken, expect to see little of me here until Sunday

0celóñe7

2:17 PM

I don't know what that means

Secret

Actually, on a deeper thought, since an ordinary lesbegue integral acts linearly on functions, it is a linear map in the vector space of functions

So perhaps, a path integral is a linear map on the vector space of functionals

skullpatrol

Wacken is the biggest heavy metal festival in the world @0celóñe7

wacken.com

Wacken, Schleswig-Holstein

Wacken is a municipality near the town of Itzehoe in Schleswig-Holstein, Germany. Wacken was first mentioned in 1148, but there were probably some settlements before, which is proven by the trove of Germanic artefacts. Today, Wacken is famous for annually staging the world's biggest open air metal festival, "Wacken Open Air", which has hosted popular metal acts such as Iron Maiden, Saxon, Alice Cooper, Deep Purple, Mötley Crüe, Slayer, Rammstein, Motörhead and Judas Priest. The festival is held in July and August, a period which often has stormy weather in that area. Due to the festival the entry...