Konjunktiv I is mostly used for indirect speech and wishes. The following sentence is neither: Die Funktionen ψn(x) seien Eigenfunktionen eines Hamiltonoperators Ĥ. Why is the Konjunktiv I used ...
How to read the mathematical notation of the small list below, say in a blackboard-talk. Notice that I'm not asking for the meaning, but the name of the symbol attached to "the letter" is what matters:...