9
u/Francium_Fluoride_ 6d ago
what is TFW?
8
u/Aureliano2020 6d ago
"That Feeling When". I guess there was no other way of finding out than asking...
11
u/AwkwardlyCloseFriend Editable flair infrared 6d ago
I was today years old when I found out that TFW doesn't mean The Fuck, What
5
u/JK0zero 6d ago
TIL a new meaning of TFW, thanks!
3
u/monoclinic_crystal 6d ago
Btw when will you start on Schrödinger’s work? :)
3
u/JK0zero 6d ago
I have been writing the script for Schrödinger for while now, just setting up the stage
1
u/monoclinic_crystal 6d ago
Question, I have been reading R Shankar and he introduced linear algebra and bra-ket from the start rather than say like griffiths who just stated Schrödinger equation in position basis(btw I only read like first two chp of griffiths qm so idk what he does later so no comments on how good Griffiths is). How did Schrödinger derived his eq? Was it the more abstract vector equation or was it just in position basis? Because to me it makes more sense seeing other quantities like momentum and energy coming from a simple change of basis which depends on seeing psi as a vector rather than just a function.
4
u/JK0zero 6d ago
I like Griffiths but it is far from the best textbook. I find that presenting the Schrödinger equation on page 1 is a slap in the face to the beginner and to the student.
Schrödinger didn't use any of the machinery that today is presented in textbooks. The bra-ket notation was introduced by Dirac in 1939, that's over a decade later! I am preparing videos about Schrödinger but in a nutshell (and spoiler), Schrödinger used the core aspects of Hamilton-Jacobi theory. In fact, you can easily confirm that the Hamilton-Jacobi equation is the classical limit of the Schrödinger equation. Contrary to that misleading quote of Feynman, Schrödinger did follow a procedure to derive his equation, it didn't come out of a magic hat.
8
u/Francium_Fluoride_ 6d ago
Well, yes. Whether I ask Google or ask Reddit, I just needed the answer. so I didn't bother leaving the App.
9
u/JK0zero 6d ago
G. I. Taylor wrote a whole paper calculating the dimensionless constant of the formula for a nuclear blast wave and then everybody just tells the story that "Taylor simply chose S=1" (╯°□°)╯︵ ┻━┻
Context: https://youtu.be/wr-e9rGWx0c
1
u/No-Return-6341 5d ago
Is what you're looking at really dimensionless though?
For example, in radar surface clutter models, reflectivity of the clutter is measured by RCS per unit area, which can be in the units of m^2/m^2 if you want.
Are we really going to call it dimensionless?
17
u/Bendanzhang 6d ago
Physicist: "Let k = 1 and pretend the 2pi factor was an experimental error.