He examined problems in the areas of systems of lines, classification of space curves, enumerative geometry of plane conics, singular points of plane curves, projective geometry and differential equations, elliptic functions, and assorted questions in analysis.
Siya napagmasdan problema sa mga lugar ng sistema ng mga linya, pag-uuri ng space kurva, enumerative geometry ng eroplano conics, isahan puntos ng eroplano kurva, projective geometry at kaugalian equation, tambilugin function, at assorted mga tanong sa pagtatasa.