2) Explain why are the vectors needed to describe aquantum state?
3) Why are the operators linear in quantummechanics?
4) What meaning does the eigenvalues problem have inquantum mechanics?
5) Which operators have mutualeigenfunctions?
6) What is the probability (or probability density) ofphysical quantity in its representation?
7) Which special role has energy operator in quantummechanics?
8) Name the operators with continuous and discretespectrum.
