Live data from Hacker News

Mathematicians have found a hidden 'reset button' for undoing rotation

newscientist.com

121–125 of 125 posts

Re: Mathematicians have found a hidden 'reset button' for undoing rotation

#121
this doesn't seem very difficult of a result to me; an arbitrary rotation is a move from one endpoint to each other on SO(3) wnich is double-covered by SU(2) ≅ ³; wiog consider the path between endpoints a geodesic then o course two (or even one) appropriately-scaied copies of the originaL rotation will suffice to revert it

Re: Mathematicians have found a hidden 'reset button' for undoing rotation

#122

Earlier quoted context omitted.

Sorry, with all due respect, I'm not "throwing out" thermodynamics. It's just not relevant to the discovery referenced in the article, which is only concerned with classical mechanics. Thermodynamics is not part of the theory of classical mechanics. I think perhaps you are confusing classical mechanics with classical physics.

https://en.wikipedia.org/wiki/Classical_mechanics See the beginning and the Limits of Validity section. It's "classical mechanics", "quantum", and "relativity". Thermaldynamics can overlap with quantum but there is a classical regime. Which, let's be clear https://en.wikipedia.org/wiki/Quantum_thermodynamics

I've lost track of the point you're trying to make. Are you still trying to convince everyone that quantum mechanics and thermodynamics are part of the field of classical mechanics?

Re: Mathematicians have found a hidden 'reset button' for undoing rotation

#123

Earlier quoted context omitted.

There's a bit of a caveat with the anti-twister mechanism, namely, that the wiring must be loose enough to pass around the supplied rotating part.

Wouldn't a slip ring help here?

The whole point of the anti-twister mechanism is that it doesn't use a slip ring.

Re: Mathematicians have found a hidden 'reset button' for undoing rotation

#124

Earlier quoted context omitted.

https://en.wikipedia.org/wiki/Classical_mechanics See the beginning and the Limits of Validity section. It's "classical mechanics", "quantum", and "relativity". Thermaldynamics can overlap with quantum but there is a classical regime. Which, let's be clear https://en.wikipedia.org/wiki/Quantum_thermodynamics

I've lost track of the point you're trying to make. Are you still trying to convince everyone that quantum mechanics and thermodynamics are part of the field of classical mechanics?

I never tried to claim quantum was part of classical
Post reply on HN