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u/Znalosti

r/MakeNewFriendsHere r/askphilosophy r/PhysicsStudents
▲ 87 r/askphilosophy

I'm a physics student. I would never talk like I'm an expert in other fields like medicine or philosophy, then why people who have never studied political sciences talk like they know everything and that they're political ideology is right and everyone else is wrong?

Does this have a name or is there a philosophical branch that talk about this? I'm currently reading Republic from Plato (I almost ended up studying philosophy, so I like to read about this, yet I'm not an expert and I know nothing about philosophty) and The Communist Manifesto and they're people in my family talking about Marx book like they have read and they know what communis is about, for example, it but they haven't yet they talk like their opinion/arguments (Normally those arguments have insults) are better and that I'm stupid for reading that book, but I'm tired of hearing people saying what communism is on the internet and everyone saying something different just to fit their narrative so I decided to read it.

Just in case, I'm not a communist since I don't know nothing about that and I don't even know the context when Marx Wrote that book, for example. So yeah, why people thing their opinion about topics on social sciences are important but then when it comes to medicine or physics they do not talk with the same conviction. Is it beacuse this social sciences are more "accessible"?

Sorry for my bad English.

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u/Znalosti — 23 days ago
▲ 5 r/PhysicsStudents

[Quantum Mechanics] Representation spin 3/2 in SU(2). Is the book wrong?

I'm using the book "Lie Algebras in Particle Physics" from Howard Georgi and I was trying to do the representation spin 3/2but I can't get right the matrix J_1 and J_2, but i got right matrix J_3. If anyone can help me I would appreciate it!

u/Znalosti — 1 month ago
▲ 1 r/MakeNewFriendsHere

23M looking to talk to new people

Hi, everyone! Just looking to talk to some people and have ordinary conversations. (forgive me for the most basic title in Reddit history, I didn't know what to write)

I like reading (especially sci-fi and fantasy). I study Physics, play the cello in a orchestra and practice tennis and recently I have been wanting to learn how to cook well, so I really want to start cooking classes but I don't have enough time! recommended me a good dish from your country!

I started to like photography so I can show you some pictures that i have taken, even though the quality is bad because I use my phone to take pictures, hahaha.

And I guess that's all. If I write more I'll probably look like a bot, idk. It's 3 am in my country so probably I'll answer when I wake up

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u/Znalosti — 1 month ago
▲ 16 r/PhysicsStudents

Not really my favorite topic and having a hard time understanding tensors. I think what I did is wrong because on the Left part i have mu and nu at the bottom and on the right part i have them as upper index. I mean, I'm sure it's bad because it shouldn't be this "easy" so i think i took the wrong approach, idk

Thank you to anyone who help me understand my error.

u/Znalosti — 2 months ago
▲ 27 r/PhysicsStudents

So in my mathematical physics course we are studying tensors and now we are studying lorentz transformations and in my professors notes there is a step that I don't really understand.

I don't really understand the step by step from 1.181 to 1.182 and why does the index change in 1.183. If anyone can give me a little help i would be grateful

EDIT: We are trying to derive " Partial derivative 'mu= partial derivative nu (Lambda) ^nu ( _mu ). It doesn't let me add another imagen, so I hope it's clear

u/Znalosti — 2 months ago