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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