Formulas
- 9-j symbol
- A* search algorithm
- ABA routing transit number
- AES key schedule
- AKS primality test
- A Dynamical Theory of the Electromagnetic Field
- Abel equation
- Absolute angular momentum
- Absolute magnitude
- Abstract simplicial complex
- Accelerating expansion of the universe
- Acceleration
- Achilles number
- Acid dissociation constant
- Acid salt