Quartile
One of the four divisions of observations which have been grouped into four equal-sized sets based on theirRank. The quartile including the top Ranked members iscalled the first quartile and denoted 
. The other quartiles are similarly denoted 
, 
, and 
. For
data points with of the form 
(for 
, 1, ...), the Hinges are identical to the firstand third quartiles.
- Adleman-Rumely Primality Test
- Admissible
- Adéle
- Adéle Group
- Affine Complex Plane
- Affine Connection
- Affine Equation
- Affine Geometry
- Affine Group
- Affine Hull
- Affine Plane
- Affine Scheme
- Affine Space
- Affine Transformation
- Affinity
- Affix
- Aggregate
- AGM
- Agnesi's Witch
- Agnésienne
- Agonic Lines
- Ahlfors-Bers Theorem
- A-Integrable
- Airy Differential Equation
- Airy-Fock Functions