The oral exam is a strange experience for a supervisor. At my university, PhD supervisors are allowed to be present in the exam, but can't really say anything. I sat there and observed two eminent professors - Jim Al-Khalili as the internal examiner, and Joachim Maruhn as external - quiz my student about his thesis, while I resisted the temptation to interject on his behalf. Fortunately, he'd done some very good work, with some impressive mathematical manipulations to calculate essentially analytic absorbing boundary conditions for solutions of the nuclear time-dependent Hartree-Fock equations, that the positive result was not much in doubt. The equation in the figure is one such result, looking notationally awesome as only continued fractions can do.