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- Wittenbauer's Parallelogram
- Wittenbauer's Theorem
- Witten's Equations
- Wolstenholme's Theorem
- Woodall Number
- Woodbury Formula
- Word
- World Line
- Worm
- Worpitzky's Identity
- Writhe
- Wronskian
- Wulff Shape
- Wynn's Epsilon Method
- Wythoff Array
- Wythoff Construction
- Wythoff's Game
- Wythoff Symbol
- x-Axis
- Xi Function
- x-Intercept
- XOR
- Yacht
- Yanghui Triangle
- y-Axis