challeng3·3 năm trước·discussNot in "Europe", and not in the EU as such. Only in some specific countries. Please don't generalize.
challeng3·3 năm trước·discussLibgen is a treasure trove, it's given me access to so many books that I couldn't have even bought (out of print).Check out annas-archive.org for a comprehensive book search engine :)
challeng3·3 năm trước·discussThe Princeton Companion to Mathematics: https://library.lol/main/EFA51226D14D0A95FB6F2BD8669499C5Took a few seconds to find, got any more challenges?