- #1
fpaolini
- 4
- 0
Hi, I am trying to read the chapter 2 of the book "Speakable and Unspeakable in Quantum Mechanics" from J. Bell. I have got some doubts and I would be glad if someone could help me.
I see that λ is a vector that makes the role of the hidden variable. All the tricks about the angles between a, a' and λ I think that I could understand.
Now some doubts:
The equation (1)
A(a, λ) = [itex]\mp[/itex] 1
means that A may take just 1 or - 1? So is A not an average, but a measure itself ( like spin 1/2 or - 1/2), right?
In the equation (4)
sign λ.a'
Is it means sign( λ.a' ) ? And in this case the author is just saying that A(a, λ ) = sign( λ.a' ) ? And so is it in that sense that λ would define the result of the measure? If λ.a' > 0 the measure will show the spin up, otherwise spin down.
That is all for a while.
I will go on reading the rest of the chapter.
Thanks in advance.
I see that λ is a vector that makes the role of the hidden variable. All the tricks about the angles between a, a' and λ I think that I could understand.
Now some doubts:
The equation (1)
A(a, λ) = [itex]\mp[/itex] 1
means that A may take just 1 or - 1? So is A not an average, but a measure itself ( like spin 1/2 or - 1/2), right?
In the equation (4)
sign λ.a'
Is it means sign( λ.a' ) ? And in this case the author is just saying that A(a, λ ) = sign( λ.a' ) ? And so is it in that sense that λ would define the result of the measure? If λ.a' > 0 the measure will show the spin up, otherwise spin down.
That is all for a while.
I will go on reading the rest of the chapter.
Thanks in advance.