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Color photo of a portrait of Nikolai Ivanovich Lobachevsky by Lev Kryukov. Lobachevsky has what I can honestly only describe as "emo hair," upswept in a shock that complements his moody countenance. His face is in 3/4 profile, and he is looking at the artist out of the corner of his eye. Lobacehvsky wears a dark jacket and white shirt, both with high collars. A decorative medal of some sort hangs around his next on a short red and white ribbon – possible it is part of his shirt.

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Color photo of a portrait of Nikolai Ivanovich Lobachevsky by Lev Kryukov. Lobachevsky has what I can honestly only describe as "emo hair," upswept in a shock that complements his moody countenance. His face is in 3/4 profile, and he is looking at the artist out of the corner of his eye. Lobacehvsky wears a dark jacket and white shirt, both with high collars. A decorative medal of some sort hangs around his next on a short red and white ribbon – possible it is part of his shirt.
https://files.mastodon.social/media_attachments/files/109/438/925/017/733/228/original/d085d77159037904.jpeg

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Robert McNees (mcnees@mastodon.social)'s status on Thursday, 01-Dec-2022 14:42:03 UTC Robert McNees

The mathematician Nikolai Ivanovich Lobachevsky was born #OTD in 1792. He developed a non-Euclidean geometry that shows up in areas ranging from relativity to the designs of M.C. Escher.
In Lobachevsky's geometry there exists more than one line parallel to a given line and passing through a point not on that line. Although the term "Lobachevsky geometry" is still used, we more frequently refer to it as "hyperbolic geometry" – a term introduced by Felix Klein.
Portrait: Lev Kryukov (wikimedia)

In conversation Thursday, 01-Dec-2022 14:42:03 UTC from mastodon.social permalink