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Author: WikiMatrix
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English[en]
The Russian mathematician Nikolai Ivanovich Lobachevsky and his rival, the Hungarian mathematician János Bolyai, independently defined and studied hyperbolic geometry, where uniqueness of parallels no longer holds.
Spanish[es]
El matemático ruso Nikolai Ivanovich Lobachevsky y su rival, el matemático húngaro János Bolyai, independientemente definen y estudian la geometría hiperbólica.