Always remember & never forget . . .

[fflo]

... the Fermi Golden Rule:

$$B(\omega,v-v_*)=\frac{1}{8\pi^2}|\omega\cdot(v-v_*)||{\widehat \phi}
((\omega\cdot(v-v_*))\omega)|^2$$

---you know, where the hat $\sphat$ denotes the Fourier transform and $\phi$ is a two-body interaction potential.

Comments

[peteralway.livejournal.com]

(raises hand) Ooh! Ooh! I used to understand Fourier transforms! Used them to quantify the sphericity of microscopic H-bombs. Before I was paid not to. And ultimately not paid not to.

[fflo.livejournal.com]

What a coincidence: I'm also not being paid not to study them!

[peteralway.livejournal.com]

As much as I am rusty, I do recall a certain beauty to Fourier transforms. Both in what they represent in terms of spectrum, and how you could multiply something by a sine wave, and it would come out to zero, on average, if there were no correllation, and come out to something if there were a correllation. A lot of advanced math made me want to crawl into a cave, but Fourier was simple and beautiful. I like the way your ear does it mechanically and instictively to allow you to percieve music.

Of course, all the other stuff in your post was complete gibberish to me.

[paperkingdoms]

Fourier transforms have unexpectedly become one of my favorites this semester. It gets really fun when you get to stack up the hats: a ^ on top of a v on top of a ~ for example [which popped up in class recently].

[fflo.livejournal.com]

Well, I don't understand the math, but I can get into such flukes of notation, that's for sure.

[paperkingdoms]

Oh, at least a third of my enjoyment of Fourier transforms is typographical. [the upside down hat is undoing the Fourier transform.] I think part fun of math is the bizarre lengths we go through for precise notation [your supscripts have subscripts *and* superscripts??].

[elmur-fudd.livejournal.com]

I think you just broke me.

[fflo.livejournal.com]

Broke you of what? hahhahahhaaahahahhaaa

[groovesinorbit]

Hey, I've heard of Fermi! I'm also working on an alum whose last name is Fourier. Your transforms are making my searching for him kind of a pain.

[lovelikeyeast.livejournal.com]

Sometimes I just don't understand you, Fflo.

On the other hand, it looks good.

[fflo.livejournal.com]

Speaking of looking good, I just clicked on the nolose site! WOW! Rock and ROLL, LLY!