Image: OBrien
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Description: Retrat de Matthew O'Brien (1814-1855), matemàtic irlandès
Title: OBrien
Credit: MacTutor History of Mathematics: http://www-history.mcs.st-andrews.ac.uk/PictDisplay/OBrien.html
Author: Unknown authorUnknown author
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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