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24 sett 1931 anni - В 1931 году А. А. Ляпунов знакомится с академиком Н. Н. Лузиным

Aggiunto al nastro di tempo:

А.А.Ляпунов-лента времени

7 dic 2017

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1047

Data:

24 sett 1931 anni

Adesso

~ 94 years ago

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