1 December 2015

Nikolai Lobachevsky

Nikolai Lobachevsky.
Nikolai Lobatševski.
Николай Лобачевский.

Stamp. USSR, 1951.
My collection.

* Nikolai Lobachevsky (1 December /O.S. 20 November/ 1792 - 24 February /O.S. 12 February/ 1856) was a Russian mathematician and geometer, known primarily for his work on hyperbolic geometry, otherwise known as Lobachevskian geometry. - Wikipedia.

* Nikolai Lobatševski oli vene matemaatik ja geomeeter, nn Lobatševski geomeetria rajaja.

* Николай Лобачевский (/20 ноября/ 1 декабря 1792 - 24 февраля 1856) - русский математик, создатель неевклидовой геометрии.

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