Nikolai Lobachevsky (1792-1856) publishes his work on hyperbolic non-Euclidean geometry. Lobachevsky postulated that there is more than one parallel line through any given point; a consequence is that the sum of angles in a triangle must be less than 180 degrees. Non-Euclidean geometry is now in common use in many areas of Mathematics and Physics, such as general relativity.
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Citation: Editors, Litencyc. "Development of non-Euclidean geometry (2)". The Literary Encyclopedia. First published 01 May 2009 [https://www.litencyc.com/php/stopics.php?rec=true&UID=6267, accessed 06 May 2024.]
