In 1911 he was awarded the title of Candidate of Commerce and he was awarded the Gold Medal. Ostrowski had not been a mere observer in Grave 's seminar during these years, however, for by the time he completed his studies at the College of Commerce he had already found original results on Galois fields and had written his first paper with Grave 's assistance.
Sa 1911 siya ay iginawad sa pamagat ng mga Kandidato ng Commerce at siya ay iginawad sa Gold medalya. Ostrowski ay hindi pa isang lamang tagamasid sa libingan 's pantas-aral sa panahon ng mga taon, gayunman, sa pamamagitan ng mga oras niya natapos ang kanyang pag-aaral sa College of Commerce niya na natagpuan ang orihinal na mga resulta sa Galois patlang at may nakasulat na kanyang unang papel sa libingan' s tulong.