Brian Beckman

Astrophysicist, EX-Meta, GSIT, Amazon, Microsft, NASA/JPL

[Brian Beckman @lorentzframe]

Lie theory, featuring 3D rotations - Online Technical Discussion Groups—Wolfram Community https://t.co/85TVBNBJmd

All about su(2), so(3), SU(2), SO(3), packed into 21 pages with proofs. My latest staff pick.

[Brian Beckman @lorentzframe]

@CompSciFact I actually have a copy in paper. Amazing book!

[Brian Beckman @lorentzframe]

Why SU(2) is a better choice than SO(3): my latest staff pick at the Wolfram Community:
https://t.co/NRmv66JvR9

[Brian Beckman @lorentzframe]

How about calculating the dynamics of a pendulum or a symmetrical top from geodesics in a curved manifold, SO(3)? See my latest Staff Pick at the Wolfram Community

SO(3) Gauge Theory for Classical Mechanics in UD

https://t.co/9M4UiO72Kd

[Brian Beckman @lorentzframe]

As promised, here is the Schwarzschild metric ab-initio. No dragons this time. Only college maths are needed. It was found almost immediately after the publication of Einstein's General Relativity by Karl Schwarzschild while he was enlisted in WWI.

https://t.co/G7DZvikA0H

[Brian Beckman @lorentzframe]

If you liked Schwarzschild black holes, you'll love spinning Kerr black holes, but beware the fearsome dragon!

Read about the Wizard's Quest here, my latest Staff Pick at Wolfram Community:

https://t.co/IZIIgDp3yR

[Brian Beckman @lorentzframe]

Truly excellent notes on non-quantum field theory: https://t.co/cYbmpt7lgH. While "charting" my own path through diff. geom and all that at Wolfram Comm. https://t.co/RrQLo1jWFV, I stumbled on Charles Torre's, aimed straight at the sweet spot for a physicist: just enough rigor.

[Brian Beckman @lorentzframe]

Interactive Black-Hole Dynamics with the Relativity Toolkit

My latest Staff Pick at Wolfram https://t.co/SVTlQwXROl

source on GitHub: https://t.co/66IfhTw918

[Brian Beckman @lorentzframe]

Covariant derivatives etc. in the UD calculus: moving toward black-hole physics ab-initio. My latest staff pick at Wolfram :) https://t.co/BIL7pmmWCm

[Brian Beckman @lorentzframe]

@macro_synergy Good grief! Looks just like the physics of racing tires: (steering angle on horizontal axis, lateral force delivered on the vertical axis; https://t.co/GxZNaaLENr).

[Brian Beckman @lorentzframe]

How to Land a Rocket

https://t.co/Tx5hdmDvUL

[Brian Beckman @lorentzframe]

@LogicPractice TLA is not used enough in actual practice. The next time you have a deadlock, a buffer overflow, or a protocol failure, think how you might have saved time by designing it correctly in the first place instead of having to debug it in the field.

[Brian Beckman @lorentzframe]

@Con_McShaff @adad8m I read act V first, then backtracked through the rest.

[Brian Beckman @lorentzframe]

@elonmusk I'll be impressed when he can lock his knees. Entirely different control regime. This is still overactuated. Watching this make me feel lactic acid build up in my quadriceps.

[Brian Beckman @lorentzframe]

@unclebobmartin i hve both emacs and intellij open, with mutual refresh. i edit and cider clojure in emacs. best debugger. i refactor in intellij. back and forth. use each for whatever is easier. pycharm and clion are nonpareil for debugger integration. emacs is sine qua non for everything else.

[Brian Beckman @lorentzframe]

@DataSciFact https://t.co/deh9cayp97

[Brian Beckman @lorentzframe]

@DataSciFact By observing probabilities of all sequnces of four words (4-grams) in "Alice in Wonderland", I could generate gramatical travesties (random strings) that actually read plausibly. Here's a snippet from an ancient notebook:

[Brian Beckman @lorentzframe]

@DataSciFact and several other curious creatures. alice led the way, and the whole party at once crowded round her, calling out in a trembling voice i passed by his garden. alice did not feel encouraged to ask any more questions about it, so she turned to the dormouse, not choosing to notic

[Brian Beckman @lorentzframe]

@leithaus Four things I thought of on the spot were "credit," "a song," "a number," and "love."

[Brian Beckman @lorentzframe]

@leithaus A wise man once asked me "Can you think of something that is 'real' but not 'material?'" I could think of many such things, but I wish I had said "Santa Claus!"

[Brian Beckman @lorentzframe]

@AlgebraFact I think there's a similar handy rule for divisibility by 29: let q and r be quotient and remainder when n is divided by 900. 29 divides n iff 29 divides q + r because 900 = 29 * 31 + 1.