| 2.3.3 Commands and Functions returning RAT |
| abs | absolute value of a number |
| ApproxSolve | Approximate real solutions for polynomial system |
| AsRAT | convert into a RAT |
| CFApprox | continued fraction approximation |
| CFApproximants | continued fraction approximants |
| ContFracToRat | convert continued fraction to rational |
| CpuTime | Counts cpu time |
| FloatApprox | approx. of rational number of the form M*2^E |
| SimplestBinaryRatBetween | find simplest binary rational in a closed interval |
| SimplestRatBetween | find simplest rational in a closed interval |