I see,after you finished your diplom in germany,it must be much easier for you to continue your study here.for us the biggest problem is the language,not the content.I find it is getting much easier for me to have a good score compared with the beginning.
(ps:I think the situation might be the same if you continue your Phd in germany,so just do not give such a unresponsible judement,if you do not know it well.and just talk to someone,who also studies mathematics here,maybe mathematics in the university of vienna is really not that good,and you should go back to germany.)
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