... necessary for understanding quantum chemistry. What is needed?• Postulates of quantum mechanics, Chapter 1 (necessary).• Matrix algebra, Appendix A, p. 889 (advised).• Centre -of- mass separation, Appendix ... as of one of its components, denoted byˆJz) commute. Oneis able, therefore, to measure simultaneously the energy, the square of to-tal angular momentum as well as one of the components of ... in-formally professor, formallyonly the assistant of DavidHilbert at the University of Göttingen (in the first quar-ter of the twentieth centurywomen were not allowed tobe professors in Germany).Her...