Unit Circle
A Circle of Radius 1, such as the one used to defined the functions of Trigonometry.
See also Unit Disk, Unit Square- Armstrong Number
- Arnold Diffusion
- Arnold's Cat Map
- Arnold Tongue
- Aronhold Process
- Aronson's Sequence
- Arrangement
- Arrangement Number
- Array
- Arrowhead Curve
- Arrow Notation
- Arrow's Paradox
- Art Gallery Theorem
- Articulation Vertex
- Artin Braid Group
- Artinian Group
- Artinian Ring
- Artin L-Function
- Artin Reciprocity
- Artin's Conjecture
- Artin's Constant
- Artin's Reciprocity Theorem
- Artistic Series
- ASA Theorem
- Aschbacher's Component Theorem