Recent content by Luke_Mtt

Exactly. Because the authors gave the final equations by saying "this vector can satisfy this particular conditions". But both in |r⟩, |l⟩ and |i⟩, |o⟩ I didn't understand how they have derived the αu and αd coefficients for this four spin states.

Practically it is said that, given two spin states |u⟩ (up) and |d⟩ (down) - which are the spin measured along the +z and -z semiaxes - such that they are orthogonal ( ⟨u|d⟩ = ⟨d|u⟩ = 0), it is possible to write any other spin states using a linear combination of these two (because they are a...