Sampling Function
The 1-D sampling function is given by
where
is the Dirac Delta Function. The 2-D version is
which can be weighted to
where
is a reliability weight, 
is a density weight (Weighting Function), and 
is a taper.See also Shah Function, Sinc Function- Affine Transformation
- Affinity
- Affix
- Aggregate
- AGM
- Agnesi's Witch
- Agnésienne
- Agonic Lines
- Ahlfors-Bers Theorem
- A-Integrable
- Airy Differential Equation
- Airy-Fock Functions
- Airy Functions
- Airy Projection
- Aitken Interpolation
- Aitken's Delta Squared Process
- Ajima-Malfatti Points
- Albanese Variety
- Albers Conic Projection
- Albers Equal-Area Conic Projection
- Alcuin's Sequence
- Aleksandrov-Cech Cohomology
- Aleksandrov's Uniqueness Theorem
- Aleph
- Aleph-0