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- Quotient Ring
- Quotient Rule
- Quotient Space
- q-Vandermonde Sum
- R
- R-
- R+
- Raabe's Test
- Rabbit Constant
- Rabbit-Duck Illusion
- Rabbit Sequence
- Rabdology
- Rabin-Miller Strong Pseudoprime Test
- Rabinovich-Fabrikant Equation
- Racah V-Coefficient
- Racah W-Coefficient
- Radau Quadrature
- Rademacher Function
- Radial Curve
- Radial Point
- Radian
- Radiant Point
- Radical
- Radical Axis
- Radical Center