François Jacquier

François Jacquier, OFM ( born June 7 in 1711 in Vitry -le- François, † July 3, 1788 in Rome) was a French mathematician, physicist and theologian.

Jacquiers scientific talent was early by a priest, who taught him to be recognized and promoted. At age 16 he joined the Friars Minor ( Franciscans, Franciscans) who sent him to study in Rome, the French convent of the Order, La Trinité du Mont He studied mathematics and classical languages, Latin, Greek and Hebrew there. He made such progress that he was the Cardinals Giulio Alberoni cartridged of Joaquín Fernández de Portocarrero Mendoza ( 1681-1760 ). With Alberoni he visited Ravenna and was commissioned to inspect the construction work begun by Manfredi against flooding the area. After returning to Rome, he was appointed professor of Sacred Scripture at the College of Propaganda ( the Congregation for the Evangelization of Peoples, the Sacred Congregation de Propaganda Fide ). In addition, he instructed the General of the Order in Marseille, to work on the history of the Order.

In 1742, he was the Pope Benedict XIV with his colleagues Professor Thomas Le Seurat ( also a French Minority ) and the Jesuit Ruger Boskovic to issue an opinion on the Samierung the dome of St. Peter's, which was released in 1743. At the dome cracks had occurred, and its opinion is generally considered the first static reports the history of civil engineering. In 1744 he visited Voltaire and Émilie du Châtelet in Castle Cirey, where he encouraged Madame du Chatelet in their Newton studies ( they created the French translation of Newton's major work ). But in 1745 he was appointed by the King of Sardinia Victor Amadeus II Professor of Physics at the University of Turin, instead he took him by the Cardinal Silvio Valenti Gonzaga ( 1690-1756 ), minister of the Pope, offered post of Professor of Experimental Physics the college at the mouth. In 1763 he was mathematics and physics teacher of Prince Ferdinand of Parma. In 1773 he became professor of mathematics at his college, after a Jesuit had to give way in the course of official Rückdrängung of the Order.

Jacquier was the main European academies of his time in conjunction. With his colleagues he gave Le Seurat from 1739 to 1742 in Geneva, an annotated edition of Isaac Newton's Philosophiae Naturalis Principia Mathematica (to which, however, other scientists participated ) and wrote an Analysis textbook.

Jacquier is praised by Goethe in the " Italian Journey " by Johann Wolfgang. On January 25, 1787 Goethe wrote in about an encounter with Jacquier in Rome:

" A few days ago I visited the Father Jacquier, a Franciscan, to Trinità de ' Monti. He is a Frenchman by birth, known by mathematical writings, advanced in years, very pleasant and understanding. He knew his time the best men, and has even spent a few months with Voltaire, who took him in very affection. "

• With Le Seurat ( authors and publisher ) " Philosophiæ naturalis principia mathematica isaaci newtoni, perpetuis commentariis illustrata ", 4 parts in 3 volumes, Geneva
• With Le Seurat, Boskovic " Parere e riflessioni sopra I danni della cuppola di San Pietro ", Rome 1743 ( the report on the dome of St. Peter's Basilica )
• " Elementi di secondo perspecttiva I principi di Taylor ", 8 volumes, Rome 1745
• " Institutiones Philosophicæ ad studia theologica Potissimum accommodata ", 6 volumes, Rome 1757 (often reprinted in Rome, Venice and Germany, translated into Spanish )
• With Le Seurat " Eléments du calcul intégral ", Parma 1768