Please replace `Decimal` with `Rational`. (see fe6d8a7e74a2eacc9c02bad244490a74c307e7ec)
btw, I don't read Portuguese but it seems to mean "Complex of Decimal [sic] and Literal".
However in the English text, this line is "Decimal [sic]/Complex Literal" (literals for Decimal [sic] and Complex (complex number)).