📜🔄📈📉

#cliodynamics #historical cycles #social cycles #rise and fall #mathematical history #longue durée

⭕↔️🟥

#squaring the circle #classical problems #area equivalence #compass and straightedge #mathematical history

🇫🇷👩‍🏫➡️📈✨

#cauchy #kowalevski #kovalevskaya #analytic solution #pde theory #mathematical history #existence theorem