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| Keywords: Platon Poretsky.jpg Platon Sergeevich Poretsky 1846 1907 Russian astronomer mathematician and logician ru ru ΠΠΎΡ Π΅ΡΠΊΠΈΠΉ ΠΠ»Π°ΡΠΎΠ½ Π‘Π΅Ρ Π³Π΅Π΅Π²ΠΈΡ Ρ ΡΡΡΠΊΠΈΠΉ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΠΊ http //vofem ru/ru/articles/48701/ page 146 Vofem before 1907 PD-RusEmpire Mathematicians from Russia | ||||
