| R | NumHask.Prelude |
| R1 | NumHask.Prelude |
| Ratio | NumHask.Data.Rational, NumHask, NumHask.Prelude |
| Rational | NumHask.Data.Rational, NumHask, NumHask.Prelude |
| ray | NumHask.Algebra.Metric, NumHask, NumHask.Prelude |
| Read | NumHask.Prelude |
| read | NumHask.Prelude |
| readFile | NumHask.Prelude |
| readIO | NumHask.Prelude |
| readList | NumHask.Prelude |
| readLn | NumHask.Prelude |
| readParen | NumHask.Prelude |
| ReadS | NumHask.Prelude |
| reads | NumHask.Prelude |
| readsPrec | NumHask.Prelude |
| Real | NumHask.Prelude |
| RealFloat | NumHask.Prelude |
| RealFrac | NumHask.Prelude |
| realPart | NumHask.Data.Complex, NumHask, NumHask.Prelude |
| realToFrac | NumHask.Prelude |
| Rec0 | NumHask.Prelude |
| Rec1 | |
| 1 (Type/Class) | NumHask.Prelude |
| 2 (Data Constructor) | NumHask.Prelude |
| recip | NumHask.Algebra.Multiplicative, NumHask, NumHask.Prelude |
| reduce | NumHask.Data.Rational, NumHask, NumHask.Prelude |
| rem | NumHask.Data.Integral, NumHask, NumHask.Prelude |
| Rep | NumHask.Prelude, NumHask.Prelude |
| Rep1 | NumHask.Prelude, NumHask.Prelude |
| repeat | NumHask.Prelude |
| replicate | NumHask.Prelude |
| return | NumHask.Prelude |
| reverse | NumHask.Prelude |
| Right | NumHask.Prelude |
| RightAssociative | NumHask.Prelude |
| Ring | NumHask.Algebra.Ring, NumHask, NumHask.Prelude |
| round | NumHask.Algebra.Field, NumHask, NumHask.Prelude |