His time for research was now limited but he still made important contributions undertaking research on infinitesimal geometry, projective geometry and the differential geometry of curves and surfaces.
Kanyang oras para sa pananaliksik ay limitado na ngayon pero siya pa rin ginawa mahalagang kontribusyon sa pagsasagawa pananaliksik katiting na katiting geometry, projective geometry at ang mga kaugalian geometry ng mga kurva at ibabaw.