## 1736 – Lagrange – bio

Guiseppe Lodovico Langrangia, aka Joseph Louis (Luigi) Lagrange was born in 1736 and grew up in Turin, Italy, but also lived in Prussia and France. He is primarily known as a mathematician but also made contributions to astronomy. Euler and Lagrange collaborated to create the Euler-Lagrange equation and created the field called calculus of variations. Lagrange created the sub-field of differential equations known as partial differential equations and did work on probability theory that inspired Ruffini, Abel and Galois to create group theory.

In the field of astronomy, Lagrange did work on planetary orbits and mechanics and discovered Lagrange points which are stationary and stable orbital positions between two larger bodies, such as the Earth and the Moon.

PRECURSOR:

**1571 – Kepler**

**1643 – Newton**

1656 – Halley

1685 – Taylor

**1700 – Bernoulli**

CONCURRENT:

**1707 – Euler**

1717 – D’Alembert

**1749 – Laplace**

SUBSEQUENT:

**1765 – Ruffini**

**1768 – Fourier**

**1781 – Poisson**

**1786 – Arago**

**1789 – Cauchy**

**1802 – Abel**

**1804 – Jacobi**

**1805 – Hamilton**

**1809 – Grassman**

**1811 – Galois**

**1815 – Boole**

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