@Akash.B you should download 11 and 12th ncert books. And then clear the theories in YouTube. That might be decent for theory of olympiad.

I feel that it is telling that the Abstruse Goose on prerequisites has our hero using a exclamation mark for the first time while reading about Classical Mechanics.

It is very easy to underestimate the depth and power of those frameworks because they have been rather eclipsed by modern physics.

There are depths to classical physics that most of us never even look at.

@dmckee how do you find such cartoons?

@ZeroTheHero Hang out with enough other geeks.

abstrusegoose.com/secretarchives/prerequisite-7

In order to understand people, you need to understand string theory

@ZeroTheHero it's a standard joke here

Subject in order of prerequisite:

I'm listening to Taylor Swift on the radio. God have mercy on my soul.

You dont like her?

@JohnRennie No mercy for you, I am afraid. That's like a sin. :P

Common sense < Experience < Language < Logic < History < Truth < Identity < Ontology < Precalculus < Euclidean Geometry < Basic arithmetic < Basic algebra < Calculus < Complex analysis < Linear algebra < Group theory < Ring theory < Field theory < Representation theory < Quasigroup theory < Semigroup theory < Metric space < General topology < ZFC set theory < Real analysis < Measure theory < Functional analysis < Probability < Statistics <

@Secret what order is this?

@Sid I'll listen to some Napalm Death in penance

@JohnRennie ^

Subject in order of prerequisite (to imitate abrruse goose)

I have never listened to that..

We all knew it is branching tbh, but my main point is the subject at the very end

so anything in the middle is irrelevant to 0th order

Combinitorics < Number theory < Tensor algebra < ODE < PDE < Dynamical systems < Chaos theory < Differential geometry < Manifolds < Conifolds < Generalised manifolds < Algebraic topology < Algebraic geometry < Schemes < Filters < ... < Category theory < nCat < infinite topoi < Interuniversal techimuller theory < Foundations <

Newtonian mechanics < Classical mechanics < Continuum mechanics < Classical field theory < Equlibrium thermodynamics < Electromagnetism < Quantum mechanics < Statistical mechanics < Solid state physics < Classical optics < Special relativity < Astrophysics < General relativity < Relativistic quantum mechanics < Quantum field theory < Cosmology < String theory < Loop quantum gravity < Causal sets < Causal dynamics triangulation < ... < Quantum Gravity <

Elementary chemistry < Periodic table < Diatomics < Polyatomic ions < Acid bade chemistry < Redox chemistry < Chemical equlibrium < Chemical kinetics < Spectroscopy < Quantum chemistry < Transition state theory < Dynamical effects < Radical chemistry < Nonequlibrium thermodynamics < Computational chemistry < Substitution reactions < Addition reactions < Alkene reactions < Alkyne reactions < Aromatics < Haloalkanes < Alcohols < Carbonyl chemistry < Amine chemistry < Heterocycles <

@Secret lol

Diels Aldar chemistry < Organic catalysis < Ionic liquids < Main group chemistry < Coordination complexes < Organometallics < Supramolecular chemistry < MOFs < COFs < Electrochemistry < Batteries < Energy storage < Radiochemistry < Polymer chemistry <

Guys, about rational and irrational numbers. We said that pi is an irrational number, because it can't be described as a fraction or a/b where both are integers. Well 22/7? Maybe that's the rational form of pi?

@NovaliumCompany that's an approximation of pi. Not its exact value

Hmm, got it. So 22/7 is not equal to pi, just a very close number.

I already know alcohols

... < Environmental chemistry < ... (too lazy to list these) < Basic biology < The cell < Organs < Systems < Genetics < Biochemistry < Proteins < Enzymes < Molecular biology < Evolutionary biology < Microbiology < Botany < Zoology < Ecology < Anatomy < Biomimetics < Synthetic biology < ... < Natural products < Radiochemistry < Drug discovery < Pharmacology < ...

I don't know how to type branches in a linear fomat

The reality is that the prerequisites form a network instead of a linear chain

Psychology < Neuroscience < Computer sciences < Information science < ... < Economics < Finance < Management < Marketing < Linguistics < Law < Political science < Sociology < Political economy < ...

< Archaelogy < Music < Literacy < Applied arts < Fine arts < Aesthetics < Performance < Cinematography < Animation < Virtuality reality < Metaverse < ... < Design < Fashion < Urban planning < ...

< Humanities < Tradition < Choreography < Culture < Religion < Spirituality < Theology< ... < Politics <

Nature of time < Time travel < Emotions < Hate < Anger < Love < Indifference < People < ... < Mind < God < ...

Stop.

(A few uncountable ordinals later...)

< The Plan

> In order to rewrite reality and its outdated laws, one must fully understood reality itself

(although tbh ,the thing I want you to focus on is how much prerequisite is needed to understand Love and people)

Human beings are inherently complex creatures. It is a miracle why we exist

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A couple of years ago 2013ish I think. I read that a physicist wrote a paper where we could go faster than light by not technically going faster than light. Was there any follow up on that. I can't seem to find anything online.

English please

:P

Oh ftl= faster than light

@Blue Has he started liking her stuff?

If he has, I am sorely disappointed in JR. :P

@Blue there was a big festival in the UK this weekend organised by the BBC. It was broadcast on the radio all weekend and now they're broadcasting highlights.

And Taylor Swift was the headline act.

To be fair she's very good at what she does. She's paid to entertain, and she does that well.

It's just not really my type of music.

@JohnRennie only listens to old people music

@Slereah I do still listen to my old favourites from the 70s, but I mainly listen to BBC Radio 6 and that plays lots of new stuff too.

the rock'n'roll

Dubstep is a crime against humanity

Dubstep! That's going back a bit. It must be 15 years ago I first started hearing dubstep on the indie radio shows.

I quite like the more mainstream dubstep like Chase and Status. The more hardcore end passed me by.

Dubstep is only good if you don't pair that with atmospheric music

I seldom listen to music.

If reality is a dream, then what is reality

If dream is a reality, then what is dream

If A is B, then what is A

ABA

3 letters

A triangle has 3 sides

And what else has 3 sides

@CaptainBohemian I know the perfect song for you

downvote help vampires to nonexistence

Your solution dies not exist

egad

Allo

WhatsApp?

XD

dies

Can't think of a dumber way to do this stupid identity and the other ones like it

yeah it's usually simpler for pretty much all trig identities

help its too hot

I am dying of death

Lots of Mort-speak in here today for Mort Monday :p

All we are is dust in the wind, dude

Popov how I love you

Here's a friendly reminder that folks who would like to discuss flagging or chat suspensions should join the ongoing and productive conversation in the Physics Meta room rather than raising the issue in here. Room owners will move misplaced discussions as necessary.

Noted

→ 29 messages moved to Physics Meta, as noted above.

The thing on top of that, is the curry?

Yes

It was absolutely delicious :-)

Looks like Tomato purée except it is more yellowish and less red

I don't feel it looks delicious.

(To me, it looks like someone just excreted on your food @JohnRennie :P)

It's got tumeric in, that's why it's yellow.

(Obviously. I know a bit of cooking myself.)

And if your excrement looks like that you need to consult a doctor urgently! :-)

@JohnRennie I think it looks like that when I am sick. Watery-yellowish thing. :P

Italians would find that pic offensive :P

@Sid That's ... too much detail. Much too much detail in fact :-)

@JohnRennie it's a shame you have already eaten. Had you not eaten, I would have gone even more detail. :P

I don't know anything about cooking; all cooking I have done is putting all material in a pot over a stove to heat.

All the cooking I have ever done is Chapati, Noodles, Lady-finger and Tea(If that counts)

I should learn more

I have only cooked noodles with vegetables. I don't think I will learn much about cooking because I just feel it boring.

Anti-commuting variables are to be respected and feared :\

then what about non-commuting variables?

They are a whole other ballgame

Say you have an electron in the $3p$ orbital with spin up and apply a magnetic field

Now you are interested in finding the maximum energy level splitting

Let's say the field is strong enough for us to consider the Paschen-Back effect

There is a nice discussion of the Zeeman and Paschen-Back effects here

The energies are thus $E=\underbrace{E_0}_{=0} + B_z \mu_B(m_l+\underbrace{g_s}_{\approx 2}m_s)$ and with $l=1$ and spin-$1/2$ we have $\max(m_l) = 1, \max(m_s) = 1/2$ so you might say $E_{\max} = 2\dfrac{eB_z \hbar}{2m} = \dfrac{eB_z \hbar}{m}$. But what of $E_{\min}$? The selection rules say $\Delta m_s= 0$ and $\Delta m_l = 0, \pm 1$ so you might think our $E_{\min}$ would simply be $\dfrac{eB\hbar}{2m}(-1+1) = 0$ but according to my professor, $E_{\min} = - \dfrac{eB_z \hbar}{m}$.

How is this explained?

@JohnRennie Thanks, I will have a look

Ok, we see how if $m_j = l + s = 3/2$ then Zeeman and Paschen-Back are approximatively equal

But I still don't see how in my case $\Delta E^{\max} = \dfrac{2e B_z \hbar}{m}$

The case I am considering is energy level splitting for the $3p$ electron in Al

Greetings. Are there any direction of movements predicted to be impossible by general relativity

My office mate talked about a paper he read gr

And we cannot find the name of it

[Random]

Time travel in a nutshell

When history changes, it is a homotopy from one timeline to another

so yeah, we need infinitely many dimensions to include a bulk consists of all possible changes to a timeline and the observers functions to take slice of this infinite dimensional manifold

and thus what they saw, are these slice moving through the bulk

P.S. I am extremely certain this model wil break down once I put in more than 3 history changes

So... unlike in Steins Gate, we need to label timelines with real numbers

and we need uncountably many sets of these because the bulk is SO BIG

This model is still not very satisfying because it is so general to the point of not being predictive since there is no constraint on what can be prescribed in the configuration of the bulk itself. I need to learn more physics and think of a better model

What are the rules for a molecule transitioning between rotational/vibrational states simultaneously?

If the rotational states and vibrational states couples strongly, then there is not heuristic but only the computation of the transition moment integral of the rovibrational state

Is that the same as $LS$-coupling?

It is the same for rotational states

@Secret If the molecule is in an excited state and there's no external energy being given it, are the only possible transitions $\Delta V, \Delta J = -1, \pm 1$?

Yeah, and once it gets to the vibrational ground state, it can relax mainly via fluoresence back to the electronic ground state

Could the molecule go from an excited vibrational state $V$ to $V+1$?

Like, some situation where it goes to a higher vibrational state and lower rotational state

That will only be possible if it is at some excited electronic state and then as it relaxes back, part of its vibrational state at a lower electronic state get excited. It is how you get antistokes if I recall

The hard and fast rule is that the molecule can never went to a state with more energy than it start with without things like an external energy supply

Anyway, its 4:00, I am heading to sleep

Thanks for the help! Good night :)

@JohnRennie Just made beef teriyaki for the first time :)

@bolbteppa LMFAO

2013 JBP best JBP

AHAHAHA

He used to drop truth bombs after truth bombs wtf

what happened to the old JBP

@BalarkaSen Really need to figure out what Godel actually said now :p

Godel's theorems are unfortunately misinterpreted in many articles and textbooks - both scientific and pseudoscientific. But JBP breaks all boundaries

@BalarkaSen He became a Messiah of the anti-SJW in recent times. That changes people. :P