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Uhlenbeck could not have had a Bachelor's Degree from Leiden University in 1920
For the simple reason that the Netherlands did not have or recognise Bachelor's Degrees until very recently. The most likely degree for Uhlenbeck to have been awarded in 1920 would have been the title of doctorandus (drs.), roughly equivalent to a Masters Degree. The normal sequence at Dutch universities was, until recently : Propadeuse (2yrs), Kandidaats (2yrs), Doctoraal (1yr). Only the Doctoraal was actually a finishing degree and allowed the qualifier to put the drs. title in front of his name, the others merely marked the completion of a set of exams and of a set number of papers. Roughly 90% of students would leave to start their careers after obtaining their drs, only 10% spending another 4 yrs on writing a dissertation and obtaining the title of doctor (dr.) which is marked as 'PhD' in the Anglo-Saxon system (tho' somewhat more easily obtained there, it seems). I didn't update the text, because I don't know that Uhlenbeck got a 'drs.', I only know that it could not have been a Bachelor's. Recoloniser (talk) 00:33, 5 September 2011 (UTC)
G W Ford has written a careful biographical memoir of Uhlenbeck for the National Academy of Science; he details Uhlenbeck's early studies and describes the move to Leiden in January of 1919. Ford then goes on to write: "in december 1920 he passed the candidaat examinations, which were oral examinations in mathematics and physics and marked the end of the undergraduate years" 126.96.36.199 (talk) 02:39, 31 July 2012 (UTC)