| abs | MPS.Env |
| acos | MPS.Env |
| acosh | MPS.Env |
| all | MPS.Env |
| and | MPS.Env |
| any | MPS.Env |
| appendFile | MPS.Env |
| apply | MPS.Light, MPS.Env, MPS, MPSUTF8 |
| aren't | MPS.Light, MPS.Env, MPS, MPSUTF8 |
| asin | MPS.Env |
| asinh | MPS.Env |
| asTypeOf | MPS.Env |
| at | MPS.Light, MPS.Env, MPS, MPSUTF8 |
| atan | MPS.Env |
| atan2 | MPS.Env |
| atanh | MPS.Env |