Area-Preserving Map
A Map 
from 
to is Area-preserving if
for every subregion
of , where 
is the 
-D Measure of . A linear transformation isArea-preserving if its corresponding Determinant is equal to 1.See also Conformal Map, Symplectic Map- Area Principle
- Arf Invariant
- Argand Diagram
- Argand Plane
- Argoh's Conjecture
- Argument Addition Relation
- Argument (Complex Number)
- Argument (Elliptic Integral)
- Argument (Function)
- Argument Multiplication Relation
- Argument Principle
- Argument Variation
- Aristotle's Wheel Paradox
- Arithmetic
- Arithmetic-Geometric Mean
- Arithmetic Geometry
- Arithmetic-Harmonic Mean
- Arithmetic-Logarithmic-Geometric Mean Inequality
- Arithmetic Mean
- Arithmetic Progression
- Arithmetic Sequence
- Arithmetic Series
- Armstrong Number
- Arnold Diffusion
- Arnold's Cat Map