He published two papers On the So-called Non-Euclidean Geometry in which he showed that it was possible to consider euclidean geometry and non-euclidean geometry as special cases a projective surface with a specific conic section adjoined.
Nai-publish na siya ng dalawang mga papeles Sa So-tinatawag na Non-Euclidean geometry sa kung saan siya ay nagpakita na ito ay posible na isaalang-alang ang euclidean geometry at non-euclidean geometry bilang espesyal na kaso ng isang projective ibabaw sa isang tiyak na seksyon alimusod adjoined.