hither_shores

18 ms·

151.
by hither_shores 5y ago
The linked page is crankery, but most of the physics it's vaguely gesturing at is standard undergrad material. QFT is not, but it's not too far out of reach either.
152.
by hither_shores 5y ago
U(1) symmetry (R also works in a classical setting: it's the Lie algebra that matters) is exactly how you get a "generic three-form" to drop out of the action.
153.
by hither_shores 5y ago
Lagrangian mechanics can handle dissipative systems. In many cases, friction included, it's as simple as adding a dissipative term to the Euler-Lagrange equations. This seriously complicates the process of deriving them, but physicis
154.
by hither_shores 5y ago
Haskell has full type erasure.
155.
by hither_shores 5y ago
Monad transformers aren't quite the same thing as composed monads. (In fact, they're kind of a kludge to deal with the fact that monad composition isn't very well behaved.) Some monad transformers, like `MaybeT m a`, are just
156.
by hither_shores 5y ago
More precisely: the composition of two different monads isn't always a monad. `[IO Int]` is a perfectly sensible type, you just can't flatten a `[IO [IO Int]]`.
157.
by hither_shores 5y ago
> that the atoms will slowly return to a chaotic high-entropy organization over time, and more rapidly as forces are exerted against the magnet This is true, it's just not why magnets can lift things.
158.
by hither_shores 5y ago
> This rabbit hole in the wikipedia has led me to a dead-end explanation Trying to teach yourself physics by reading wikipedia is like trying to learn how to program by reading the C++ standard. It's a fine resource, but not for th
159.
by hither_shores 5y ago
No, that sounds more like a (very distorted) description of regularization and/or renormalization. Regularization techniques take effective field theories like the Standard Model, which are known to be inaccurate at high enough energie
160.
by hither_shores 5y ago
> So wait you are smart enough to get into caltech, smart enough to graduate with a degree in CS... If you got B’s in caltech CS I’d make you an offer for 200k+ without blinking or even asking you anything. I went to Caltech and would de
161.
by hither_shores 5y ago
All investment opportunities, to a first approximation, are competing with one another for capital. When interest rates drop, newly issued bonds become worse investments - but you've got to invest in something, so money flows into ever