Three significant contributions of the Stoic school were (i) their account of modality, (ii) their theory of the Material conditional, and (iii) their account of meaning and truth.
К трём важным вкладам стоической школы в историю логики относятся: (1) их трактовка модальности, (2) теория материальной импликации и (3) оценка смысла и истины.