Hypermatrix
A generalization of the Matrix to an 
array of numbers.
References
Gel'fand, I. M.; Kapranov, M. M.; and Zelevinsky, A. V. ``Hyperdeterminants.'' Adv. Math. 96, 226-263, 1992.
- Antimorphic Number
- Antinomy
- Antiparallel
- Antipedal Triangle
- Antipersistent Process
- Antipodal Map
- Antipodal Points
- Antipode
- Antiprism
- Antiquity
- Antisnowflake
- Antisquare Number
- Antisymmetric
- Antisymmetric Matrix
- Antisymmetric Relation
- Antisymmetric Tensor
- Antoine's Horned Sphere
- Antoine's Necklace
- Apeirogon
- Apoapsis
- Apocalypse Number
- Apocalyptic Number
- Apodization
- Apodization Function
- Apollonius Circles