István Hatvani

István Hatvani (21 November 1718 – 16 November 1786) was a Hungarian polyhistor, mathematician, natural philosopher and theologian. Born in Rimavská Sobota (then Rimaszombat), he studied at the Debrecen Reformed Theological University before setting off on his scholarly travels to Basel, Utrecht and Leiden, where he acquired doctorates in theology and medicine and studied under luminaries such as Johann Bernoulli and Daniel Bernoulli. Returning to Debrecen in 1749, he was appointed professor of mathematics, philosophy and experimental physics, introducing a rigorous Newtonian, experiment-based approach in place of the predominant Wolffian logic‑deductive method. His expansive teaching repertoire ranged from theology and ontology to mechanics, astronomy and early probability theory, making him the first Hungarian to apply the law of large numbers in mortality statistics and laying foundations for political arithmetic and proto‑economics in Hungary.

Early life and education

Hatvani began his studies at the partikuláris of the Debreceni Kollégium, attending from age 6 at the Helvetic Latin school in Rimaszombat, a preparatory division of the Sárospatak College. He advanced to its higher classes by age 23 after overcoming initial entry barriers and surviving the plague outbreak that struck Debrecen in 1739, which claimed nearly 9 000 lives and delayed college admissions by three years.