## 1792 – Lobachevsky – bio

Nikolai Ivanovich Lobachevsky was born in 1792 in Russia and became a mathematician known for developing non-euclidian geometry. He also found a method for approximating roots of algebraic equations that is now known as the Dandelin-Graffe method. Lobachevsky, Bolyai and Gauss all appear to have independently discovered the form of non-euclidean geometry called hyperbolic geometry at around the same time.

PRECURSOR:

**-0300 – Euclid**

**1596 – Descartes**

1725 – Montucla

1748 – Playfair

1769 – Bartels

**1777 – Gauss**

CONCURRENT:

1790 – Mobius

1799 – Graffe

1802 – Bolyai

**1805 – Dirichlet**

**1809 – Grassman**

**1829 – Non-Euclidean geometry**

SUBSEQUENT:

1815 – Weierstrauss

**1826 – Riemann**

1835 – Beltrami

**1842 – Lie**

**1845 – Clifford**

**1849 – Klein**

**1854 – Poincare**

**1885 – Kaluza**

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