- fp2zero? x2 x1procedure
- fp2rational? x2 x1procedure
- fp2positive? x2 x1procedure
- fp2negative? x2 x1procedure
- fp2infinite? x2 x1procedure
- fp2nan? x2 x1procedure
- x2
- flonum
- x1
- flonum
Like zero?, rational?, positive?, negative?, infinite? and nan?, but for double-double flonums.