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François Arago

François Arago
Arago Francois portrait.jpg
19th Prime Minister of France
In office
9 May 1848 – 24 June 1848
Preceded by Jacques-Charles Dupont de l'Eure
Succeeded by Louis-Eugène Cavaignac
Personal details
Born 26 February 1786
Estagel
Died 2 October 1853(1853-10-02) (aged 67)
Paris
Political party Moderate Republicans
Known for Rotary polarization
Polarizer
Eddy currents
Fresnel–Arago laws
Arago spot
Arago's rotations

Dominique François Jean Arago (Catalan: Domènec Francesc Joan Aragó), known simply as François Arago (French: [fʁɑ̃swa aʁaɡo]; Catalan: Francesc Aragó, IPA: [fɾənˈsɛsk əɾəˈɣo]) (26 February 1786 – 2 October 1853), was a French mathematician, physicist, astronomer, freemason, supporter of the carbonari and politician.

Arago was born at Estagel, a small village of 3,000 near Perpignan, in the département of Pyrénées-Orientales, France, where his father held the position of Treasurer of the Mint.

Arago was the eldest of four brothers. Jean (1788–1836) emigrated to North America and became a general in the Mexican army. Jacques Étienne Victor (1799–1855) took part in Louis de Freycinet's exploring voyage in the Uranie from 1817 to 1821, and on his return to France devoted himself to his journalism and the drama. The fourth brother, Étienne Vincent (1802–1892), is said to have collaborated with Honoré de Balzac in The Heiress of Birague, and from 1822 to 1847 wrote a great number of light dramatic pieces, mostly in collaboration.

Showing decided military tastes, François Arago was sent to the municipal college of Perpignan, where he began to study mathematics in preparation for the entrance examination of the École Polytechnique. Within two years and a half he had mastered all the subjects prescribed for examination, and a great deal more, and, on going up for examination at Toulouse, he astounded his examiner by his knowledge of J. L. Lagrange.


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