Воображаемая геометрія (Voobrožajemaja geometrija) [Imaginary Geometry]. Kazan: at the University Press, 1835. [With:] Примѣненіе воображаемой геометріи къ нѣкоторымъ интегралаъ (Primenenije voobrožajemoj geometrii k nekotorym integralam) [Application of Imaginary Geometry to Certain Integrals]. Kazan: at the University Press, 1836.
Kazan: at the University Press, 1835; 1836. First edition, extraordinarily rare offprints, of both parts of Lobachevsky’s second publication on non-Euclidean, or imaginary, geometry, following his epoch-making O nachalakh geometrii (1829–30). Hitherto, only journal issues or extracts of these articles have been accessible; Rick Watson described the journal issues as..... More
Item #6525