Question: these are complex vectors that are used to transform three-dimensional rotations into two-dimensional representations and they later played a fundamental role in quantum mechanics. cartan published the two volume work lecons sur la theorie des spineurs in 1938.
Answer: --> These are complex vectors that are used to transform three-dimensional rotations into two-dimensional representations and they later played a fundamental role in quantum mechanics. Cartan published the two volume work Lecons sur la theorie des spineurs in 1938.

Question: on that shelf was a long thin rectangular device of some kind which had a rectangular readout on the front with various bars of colored lights displayed on it -- much like some stereo systems used to have.
Answer: --> On that shelf was a long thin rectangular device of some kind which had a rectangular readout on the front with various bars of colored lights displayed on it -- much like some stereo systems used to have.

Question: distance to bus station: 3km
Answer:
--> Distance to bus station: 3km