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News
July 9, 2026
HSE Economists Use Search Queries to Forecast Birth Rates
Researchers from the HSE Faculty of Economic Sciences have shown that the accuracy of birth rate forecasts for Russia can be improved by almost 50% by incorporating the dynamics of online search queries related to pregnancy and childbirth into forecasting models. In the best-performing models, the forecasting error fell from 4.6% to 3.2%. The findings have been published in Populations and Economics.
July 8, 2026
HSE Researchers Discover Who Eats Out in Russia-And Why
Around one-third of Russians (31.3%) rarely eat out or buy ready-made meals. The core group of active consumers—those who eat out or purchase prepared food almost every day or several times a week—accounts for only about 9% of the population. These are the findings of a study conducted by the HSE Institute for Social Policy. According to the researchers eating out is no longer a marker of high social status in Russia.
July 8, 2026
HSE University and RREDA Join Forces to Support 2026 Renewable Energy of the Planet Competition
HSE University and the Russia Renewable Energy Development Association (RREDA) have signed a partnership and information cooperation agreement to support Renewable Energy of the Planet—2026, a national competition with international participation for students and early-career researchers. Applications are open on the competition's website until September 20, 2026.

 

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О новом подходе к реконструкции лекции Феодора (Tht. 147d)

Платоновские исследования. 2016. № 2. С. 258–278.
Lečić N. D.

In Theaetetus (145a–148a), Plato brings up Theaetetus’ retelling of a lesson by Theodorus of Cyrene, in which the latter demonstrated the incommensurability of the sides of squares containing three, five, and up to seventeen square feet with the side of one square foot. In this paper, we analyse modern scholarly attempts to reconstruct the exact content of the lesson. Our understanding of the fifth-century mathematics in general (and the early Pythagorean one in particular) may vary significantly depending on which methodology Theodorus actually used.

Research target: Mathematics Philosophy, Ethics, and Religious Studies
Priority areas: humanitarian
Language: Russian
Full text
Keywords: геометрияарифметикаhistory of mathematicsистория математикиgeometryTheaetetusТеэтетpythagoreansпифагорейцыTheodorus of CyrenearithmeticsincommensurabilityФеодор из Киренынесоизмеримость
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