If we define Si=(1/2)× (reduced Planck's const)×sigma(adsbygoogle = window.adsbygoogle || []).push({});

Then what will be (sigma dot vect{A})multiplied by (Sigma dot vect{B})

Here (sigma)i is Pauli matrix.

Next one is, what will we get from simplifying

<Alpha|vect{S}|Alpha> where vect{S} is spin vector & |Apha>is equal to " exp[{i×(vect{S} dot (n_hat))× Theta/(reduced Planck's const)}]

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# I Proof of some identities regarding spin angular momentum.

Have something to add?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**