Talk:Nikolai Lobachevsky

Polish origin?
His mother was evidently Russian. At least no Russian sources even doubt it. She had the Russian name and patronymic and no evidences exist she was Polish. Moreover there are strong evidences brought by some Russian historians that even his real father was Russian land-surveyor S.S. Shebarshin. — Preceding unsigned comment added by 178.70.96.209 (talk) 01:37, 22 July 2013‎ (UTC)
 * We don't go by what is "evident" or "obvious". Any information which is removed from an article because it is unsourced cannot be returned to the article without a citation from a reliable source. This is basic Wikipedia policy. Beyond My Ken (talk) 05:40, 22 July 2013 (UTC)

Birth Year
The Wikipedia article (as of November 30, 2015) shows his birth year as 1792. In the "Mathematics Encyclopedia” published by Doubleday & Company in 1977, Lobachevski's biographical entry shows his birth year to be 1793. Does anyone have a reference source for the birth year of 1792 which is presented in the Wikipedia article? Cosmo1976 (talk) 19:34, 30 November 2015 (UTC)

Disregard my birth year question. I now see the notation in the article. With gracious apology, Cosmo1976 (talk) 19:42, 30 November 2015 (UTC)