- incomplete orthogonal Latin squares
- incomplete pairwise balanced design
- incomplete system
- affine set
- affine set
- affine space
- affine space
- affine space
- affine S-scheme
- affine term structure
- affine transformation
- affine transformation
- affine transformation group
- affine variety
- affine Weigarten transformation
- affirmative judgement
- affirmative proposition
- after efficiency of wave
- after matrix surface
- AF代数
- against angles
- age-dependent branching process
- age-norm
- age of a renewal process
- age of the universe