Given the plane, he called two line segments equipollent if they are parallel, of equal lengths, and equally directed. Starting in 1832 Bellavitis developed geometrically the algebra of complex numbers.
Given ang eroplano, na tinatawag siya ng dalawang linya ng segment equipollent kung sila ay agapay, ng pantay na haba, at pantay Directed. Simula sa 1832 Bellavitis binuo geometrically ang algebra ng mga kumplikadong numero.