Mathematics - 2021-03-22 (page 3 of 3)

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leslie townes

22:00

amazon.com/Book-Life-Review-Books-Classics/dp/1590170164

he gets very in detail about his urinary problems.

user2103480

@leslietownes very valid concern

Tycho Brahe

Tycho Brahe ( TY-koh BRAH(-hee) -⁠ BRAH-(h)ə; born Tyge Ottesen Brahe; 14 December 1546 – 24 October 1601) was a Danish nobleman, astronomer, and writer known for his accurate and comprehensive astronomical observations. He was born in the then-Danish peninsula of Scania. Tycho was well known in his lifetime as an astronomer, astrologer, and alchemist. He has been described as "the first competent mind in modern astronomy to feel ardently the passion for exact empirical facts". Most of his observations were more accurate than the best available observations at the time. An heir to several of Denmark...

leslie townes

it's very interesting from a modern perspective because he is clearly suffering from PTSD. they didn't have the words for it.

i walked up a tower in copenhagen, it might have been an observatory at one point. mr. brahe was there once.

jay

I was talking about the company... ahah is that where they got their name?

Ted Shifrin

I honestly didn't know whether you were talking about the new Cardano or the old Cardano through all this.

Amin Idelhaj

Hey guys

jay

22:03

me too ! xd

Ted Shifrin

Hi, Demonark.

leslie townes

i'm just about as confused as it is possible to be. i was referring to individuals and not corporate entities.

Amin Idelhaj

Any fun math being done?

Quin

sorry, confusion is probably my fault. I was talking about crypto in general (in particular, the new cardano currency)

leslie townes

to put it mildly, i have yet to make an investment in cryptocurrency.

jay

22:10

im super tired, thanks @TedShifrin and @leslietownes ! Ill give that lecture a go tomorrow. My vector calculus will improve slowly but surely...

leslie townes

i hope to understand vector calculus someday.

best of luck.

user2103480

@jay if you want to be more confused you can check out liouvilles theorem in hamiltonian dynamics

which states that the density of particles stays constant along trajectories, expectedly

Alessandro Codenotti

@AminIdelhaj math is unfun

Amin Idelhaj

user 85795

22:28

antifun

OMG!!! is that @OldJohn?

Old John

It is indeed

user 85795

How are you doing?

Old John

By what name would I have known you before?

user 85795

its been over 6 years since your last message in here, sir

Old John

I'm fine, thanks. Spending my retirement in non-math pursuits

user 85795

22:37

coolio

Old John

That sounds about about right

How are things with you?

user 85795

fine, thanks

Old John

Great. I can't stay right now, but I will be back in less than 6 years!

user 85795

Nice seeing you, sir.

Old John

And you too!

Bye for now

user 85795

22:40

cya

Semiclassical

@user2103480 there's also a version of this for QM, though in that case the notion of trajectories is very debatable

(flow lines exist, but interpreting them as trajectories of actual particles very much goes against the grain of orthodox QM.)

Astyx

@AminIdelhaj A rook can move up or right on an $N\times N$ chess board. How many different combinations of moves make the rook go from the bottom left corner to the top right one?

Semiclassical

@Astyx my brain interpreted as knight instead of rook. and that makes me wonder what the path-graph of a chess board looks like from a knight's pov

user 85795

have you seen this, sir @Semiclassical?

Astyx

you're not the first one

Semiclassical

22:53

(for a rook it's easy: two squares on a chess board are connected if they're in the same rank or file)

@user85795 nope

the fact that it's called a virial identity does catch my eye tho

user 85795

:-)

Semiclassical

but that particularly one is fancy pants

like, where did p come from

user2103480

23:14

@Semiclassical man dont tell me these things I'm already despairing at the low level stuff

We're still dealing with the lennard jones fluid and I tried to find any info on the density of that thing in the microcanonical ensemble

Virtually all documents just use the cheap $\Bbb E[\delta(E-H)]$ trick

Amin Idelhaj

@astyx cool

Let's see

Astyx

Want a hint?

Amin Idelhaj

Well I'll think for a bit first

Astyx

You're going to need a computer at some point if you want to compute actual numbers

Leaky Nun

23:38

what are numbers

Thorgott

numbers are a special type of sheaf

anakhro

numbers aren't a mathematical concept

purely linguistic, a reminder of the horrors we endured

Astyx

Leaky, if you care to think about some analysis, would you happen to know why the integrand being rational implies the integral is an algebraic function of t?