"He believed that by demanding singularity free solutions of the nonlinear Einstein equations one would get an over-determined system of equations that would lead to quantization conditions."

Don't forget that Einstein really didn't like quantum mechanics on philosophical grounds ("God does not play dice"), so vague and inconsistent attempts at explaining away what he didn't like are to be expected :P

> “According to the theories known until now the initial state of a system may be chosen freely; the differential equations then give the evolution in time. From our knowledge about quantum states, in particular as it developed in the wake of Bohr’s theory during the past decade, this characteristic feature of theory does not correspond to reality.

> The initial state of an electron moving around a hydrogen nucleus cannot be chosen freely; its choice must correspond to the quantum conditions. In general: not only the evolution in time but also the initial state obey laws.”

Guessing: the equations being over-determined meant the initial conditions were pre-determined, and this would then let us predict what's going on?

Presumably

That would explain the old school Bohr quantization sort of idea I guess, but I don't think it would do much for measurements

This article is good

yeah that is where I learned of it

I just find it weird that nobody wrote about the idea really

Even just to prove it wrong

You'd think people would jump on some Einstein paper like that

I mean, if he never published the actual idea and just alluded to it in other papers, there was nothing for people to jump on to

Maybe it's in one of those Einstein notebooks :p

@Slereah That's a few years before the famous Bohr - Einstein debates at the 5th Solvay Conference of 1927 en.wikipedia.org/wiki/Bohr%E2%80%93Einstein_debates

why electric field of infinite depends on radius but flat sheet doesn't ?

why an electron needs exactly the ammount of energy to overcome the potential energy to be ionized ,tough potential energy is our expectation of the electron; is the potential energy averaged ; because you should take the integral of couloumb law

hi

Suppose a support vector machine for separating pluses from minus finds a support vector at point (1,0) and a minus support vector at x2=(0,1). Determine the values of w and b.

can anybody

help me with this

@Pole_Star THis might be a room for you? chat.stackexchange.com/rooms/54160/problem-solving-strategies

Giachetta's Advanced classical field theory is pretty good

Too bad the paper version is 140 bucks

The difference between $T(TM)$ and $T^2M$ is apparently the "spray condition"

whatever that is

Existe una inmersion inyectiva de $F^2(M)$ en $L(LM)$, cuya imagen es $(LM_1)$

ay caramba

not easy to search for because the terminology isn't very standard

I've seen second order tangent bundle v. double tangent bundle, but that's not really used by everyone

also occasionally the osculating bundle, but I'm pretty sure they're having fun at my expense

they are not generous on details

ah, I think that's a paper on the topic

gallica.bnf.fr/ark:/12148/bpt6k3191m/f1762.item

and there's the original Ehresmann paper