 Further noteworthy achievements in the field of mathematics are Oresme’s geometric proofs of the sums of certain converging series, particularly in his Questiones super geometriam Euclidis and his Tractatus de configurationibus qualitatum et motuum (Clagett 1974, 228). Most interestingly, Oresme seems to have given a general rule of how to find the sum of all convergent series of the form: