Simple Theorems, Proofs, and Derivations in Quantum Chemistry

Since 1983 I have been delivering lectures at Budapest University that are mainly attended by chemistry students who have already studied quantum chem­ istry in the amount required by the (undergraduate) chemistry curriculum of the University, and wish to acquire deeper insight in the field, possibly in prepara­ tion of a master''s or Ph.D. thesis in theoretical chemistry. In such a situation, I h...