Martingale inequalities -- Inequalities leading to a proof of the classical martingale-convergence theorem -- State space for Markov processes -- Hunt's theorem and axiomatic potential theory -- A reduction of continuous square-integrable martingales to Brownian motion -- Square integrable martingales, a survey -- Non-square integrable martingales etc -- Einige ergebnisse ร{156}ber die stoppverteilungen eines markoff-prozesses -- On the proofs of two theorems in probabilistic potential theory -- Diffusion processes and martingales I -- Diffusion processes and martingales II