File:Hellmuth Stachel delivering a lecture at TU Wien.JPG

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English: Professor Hellmuth Stachel delivers a lecture on Non-Euclidean Geometry at Vienna University of Technology on November 17, 2009
Русский: Профессор Хельмут Штахель читает лекцию по неевклидовой геометрии в Венском техническом университете 17-го ноября 2009 года
Deutsch: Professor Hellmuth Stachel hält einen Vortrag über Nichteuklidische Geometrie an der Technischen Universität Wien am 17. November 2009
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Author Victor Alexandrov
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17 November 2009

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current09:25, 8 December 2009Thumbnail for version as of 09:25, 8 December 20093,264 × 2,448 (3.12 MB)imagescommonswiki>Victor Alexandrov{{Information |Description={{en|1=Professor Hellmuth Stachel delivers a lecture on Non-Euclidean Geometry at Vienna University of Technology on November 17, 2009}} {{ru|1=Профе�

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