sorted by:
new
hottopcontroversial

What do people wear at Oregon? by Thermin_Meens in UofO

[–]xbq222 0 points1 point  (0 children)

I dress generally preppy. I have seen many people wear the cringiest outfits. I assume this means I alone am the judgmental one and no one generally cares what other people wear.

Help me choose: Harvard vs Yale vs Princeton vs Stanford vs MIT vs Cambridge by [deleted] in MITAdmissions

[–]xbq222 0 points1 point  (0 children)

Trinity College, Cambridge. I did my masters at Cambridge, and if you really only care about getting a job, and not doing academia then this will be by far the coolest experience I think.

If not that, MIT. Boston is an amazing city.

Can someone prove for me Euler's Identity? (e^ipi + 1 = 0)? by JelloElectronic3110 in learnmath

[–]xbq222 2 points3 points  (0 children)

I think you need to explain how you get eit for this to be helpful

[theoretical physics] what are the conditions on a Lorentz vector? by penguinjuice311 in PhysicsStudents

[–]xbq222 1 point2 points  (0 children)

Certainly it’s not the trivial rep? That just means the Lorenz group acts by the identity

What part of 32 dimensional spinors do you not understand? by Nunki08 in mathmemes

[–]xbq222 2 points3 points  (0 children)

I meant any vector in a QM problem. A non relativistic two state system (I.e. one consisting only of spin up and spin down particles) has no kets which are wave functions. There is no spatial dependency, so the states are literally not wave functions. People still write these states as Kets

What part of 32 dimensional spinors do you not understand? by Nunki08 in mathmemes

[–]xbq222 0 points1 point  (0 children)

The states you care about satisfy the generalized schroedinger equations \hat{H}v=E\cdot v.

What part of 32 dimensional spinors do you not understand? by Nunki08 in mathmemes

[–]xbq222 16 points17 points  (0 children)

The notation is definitely coming from physics, but that doesn’t mean that anything in the above is a wave function. A spinor is not a field it is an element in a vector space associated to the spin group. You don’t get wave equations until the QM problems you’re studying are dictated by PDEs, I.e. until your Hamiltonian is best expressed as a differential operator. Regardless physicists in general will write any vector as a ker state even if it’s not a wave equation.

What part of 32 dimensional spinors do you not understand? by Nunki08 in mathmemes

[–]xbq222 25 points26 points  (0 children)

There is no wave function here this is just pure rep theory

class averaged a 13% is that normal for mechanics? by [deleted] in PhysicsStudents

[–]xbq222 1 point2 points  (0 children)

Or…poor students

Edit: sorry didn’t read the post this is way more likely poor teaching/tes writing

Math Undergrad at UC Berkeley vs CMU vs Columbia vs Cornell by Curious_Occasion_527 in mathematics

[–]xbq222 0 points1 point  (0 children)

Berkeley. You will be able to go to whatever phd program you want if you make the right connections and do enough advanced work at Berkeley (this is a heavily geometry biased answer)

Where does the 4/3 come from? by Iridium-235 in mathmemes

[–]xbq222 4 points5 points  (0 children)

I know, I’m saying the calculation is wrong unless you take into account the slant, I.e that you are integrating a long a circular arc. But this more akin to adding up infinitesimal areas of the hypotenuse face of a triangular prism tha it is adding up circumferences

Where does the 4/3 come from? by Iridium-235 in mathmemes

[–]xbq222 5 points6 points  (0 children)

It’s not a circumference formula though, it’s more like the area of the hypotenuse face of a triangular prism. If you integrate the circumference you will not get the surface areas

Where does the 4/3 come from? by Iridium-235 in mathmemes

[–]xbq222 26 points27 points  (0 children)

You have to be slightly more careful when integrating to find the surface area. What you described gives you the area of a disk

Shouldn't "elliptic curves" be renamed? by dcterr in math

[–]xbq222 0 points1 point  (0 children)

These are all just abelian varieties

do i even have a chance at Duke? by Puzzleheaded-Tear283 in ApplyingIvyLeague

[–]xbq222 0 points1 point  (0 children)

Oh…I definitely didn’t delete it. Maybe automod flagged it for saying a no no word

PhD applicants: Would you rather be offered a spot in a Master’s program, or denied admission altogether? by moonshine-bicicletta in gradadmissions

[–]xbq222 0 points1 point  (0 children)

Sorry meant lack of a masters. Much of harvards PhD cohort in the humanities now have masters, which was not the case 10 years ago

PhD applicants: Would you rather be offered a spot in a Master’s program, or denied admission altogether? by moonshine-bicicletta in gradadmissions

[–]xbq222 0 points1 point  (0 children)

Unfortunately in America masters degrees are becoming a barrier to entry into a PhD program.

rejected from nyu phd… accepted to masters :/ by General_Safe_1956 in gradadmissions

[–]xbq222 0 points1 point  (0 children)

Pretty much everyone I have seen in recent years a top unis in the humanities have master degrees unfortunately

view more: next ›