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Meetings of the Moscow Mathematical Society
September 7, 2004, Moscow, MSU, auditorium 16-24.

Ïåðåñå÷åíèå âûñîò òðåóãîëüíèêîâ â ãåîìåòðèè Ëîáà÷åâñêîãî è òîæäåñòâî ßêîáè àëãåáðû Ëè êâàäðàòè÷íûõ ôîðì íà ñèìïëåêòè÷åñêîé ïëîñêîñòè

V. I. Arnol'd

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