@cindex @code{imag()}
@item @code{csgn(z)}
@tab complex sign (returns an @code{int})
+@item @code{step(x)}
+@tab step function (returns an @code{int})
@item @code{numer(z)}
@tab numerator of rational or complex rational number
@item @code{denom(z)}
@item @code{abs(x)}
@tab absolute value
@cindex @code{abs()}
+@item @code{step(x)}
+@tab step function
+@cindex @code{step()}
@item @code{csgn(x)}
@tab complex sign
@cindex @code{conjugate()}
@item @code{conjugate(x)}
@tab complex conjugation
-@cindex @code{csgn()}
+@cindex @code{conjugate()}
@item @code{sqrt(x)}
@tab square root (not a GiNaC function, rather an alias for @code{pow(x, numeric(1, 2))})
@cindex @code{sqrt()}