Étienne d'Espagnet (born c. 1596) was the son of parliamentary counselor Jean d'Espagnet and Charlotte De Mangeau. He became a parliamentary counselor...

title-page. In 1623, D'Espagnet wrote Arcanum Hermeticae philosophiae and Enchiridion physicae restitutae. His son, Étienne d'Espagnet, utilised his father's...

he produced important work on maxima and minima which he gave to Étienne d'Espagnet who clearly shared mathematical interests with Fermat. There he became...