Genady

The origin of S moves with the speed -v in S'. The body B moves with the speed u in S. Use relativistic velocity addition formula: the speed of B in S' = (u-v)/(1-uv/c2).

There is only one frame in your example. What you've calculated is, that if body A moves with velocity v and body B of the same mass moves with velocity u=v/(4-3v2/c2)1/2, then momentum of the body B equals half of momentum of the body A. All in the same one frame.

No, if it turns out to be a quantum machine, nothing can recover its state without destroying it. Yes, there are. Your nanomachines or whatever cannot measure positions and momenta of these particles and thus cannot recreate them.

No, I was not. See my response here:

Thank you. I will check it.

Would you point to these?

Life is not a state, it is rather a sequence of states. If there is only a finite number of states, the states will necessarily repeat, but the sequence will not. A sequence of a finite number of states can be infinitely long without repeating itself.

From repeated hints in posts, I understand that many members of SFN also participate in other online science forums. What's the point of it? Do mostly the same people discuss mostly the same questions on different websites? What would be a reason for me to do so?

In the related news, AI resurrection of Brazilian singer for car ad sparks joy and ethical worries | Brazil | The Guardian

Stone-age men thought that how fast you run is limited only by your abilities. We know now that it is limited by the speed of light.

Now it is YOU who is stuck in 2023, it seems. ... and other important components. For a simple example, myelin sheath structures control rate of propagation of signals in neurons. Different rates cause differences in arrival times of the signals. This affects the spikes. Etc. Lesser? This is how drugs affect brain. They don't modify neuron connections. The effects are dramatic, though. Paraphrasing YOU just a bit,

me too

In the case of quantum computers, it does.

Neurons and their connections are not the whole story of the brain. Quantum computers are macro, too. They operate on quantum, nevertheless.

It is definitely more than this. Much more. Quantum Mechanics' laws are.

In quantum computers, only one impulse travels at a time. It does not make them any "less" quantum. "Quantum" does not mean "fuzzy". It means that elementary units are quantum states, and operations are unitary.

So, in the near future all movies will be realistically looking computer animations. Aren't they already?

It is an appealing hypothesis.

The latter are quantum in nature, and I think that the "calculations" which brain runs are quantum.

It is not. Quantum mechanics prohibits this. No technology overcomes laws of nature.

(1) There is a similar thread here: (2) Online it happens all the time. As soon as I touch a topic by reading or writing online, the ads and news related to the topic start flowing onto my screen.

Here is why the total spin J for the sss baryon cannot be 1/2, AFAIU: The wavefunction for a baryon (a fermion) has to be anti-symmetric. In the ground state, this wavefunction is a product of the wavefunctions for spin * flavor * color. This product has to be anti-symmetric. Since all three quarks are of the same flavor, the flavor wavefunction is symmetric. Thus, the product of the wavefunctions for spin * color has to be anti-symmetric. Next, (Phy489_Lecture9a_2013.ppt (utoronto.ca)) Since the color wavefunction is anti-symmetric, for the product of wavefunctions for spin * color to be anti-symmetric, the wavefunction for spin has to be symmetric. The three 1/2-spin wavefunction is fully symmetric only in the case of all three spins being the same, i.e., J=3/2. It is not fully symmetric if one spin is different from the other two, i.e., if J=1/2. QED

If you don't record all the necessary information, you cannot restore the original state. I claim that it is in principle impossible to collect all the necessary information. This makes your case implausible.

I guess that the OP question is answered. As a personal OT note I wanted to mention that I don't have a positive vibe regarding Y. Ne'eman because he is rather familiar to me as a right-wing politician that he was when I lived in Israel.

Yes, this is it. Any particle with a spin number s has 2s+1 possible spin values.