From One to Many Geometries – Professor Raymond Flood

For 100 years up to the end of the 19th century the study of geometry was completely changed with the development of non-Euclidean geometries and the use of techniques to think of geometries in higher dimensions – a development essential to Einstein in his development of the theory of General Relativity.

"The mathematician's patterns, like the painter's or the poet's, must be beautiful; the ideas, like the colours or the words, must fit together in a harmonious way. "
G H Hardy, A Mathematician's Apology (London 1941).
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