Triangle Function
 |  |  | (1) |
 |  | (2) | |
|  | (3) |
where
is the Rectangle Function and 
is the Heaviside Step Function. An obvious generalizationused as an Apodization Function goes by the name of the Bartlett Function.There is also a three-argument function known as the triangle function:
 | (4) |
 | (5) |
- Watson's Theorem
- Watt's Curve
- Watt's Parallelogram
- Wave
- Wave Equation
- Wavelet
- Wavelet Matrix
- Wavelet Transform
- Wave Operator
- Wave Surface
- Weak Convergence
- Weak Law of Large Numbers
- Weakly Binary Tree
- Weakly Complete Sequence
- Weakly Independent
- Weakly Triple-Free Set
- Weber Differential Equations
- Weber Functions
- Weber's Discontinuous Integrals
- Weber's Formula
- Weber-Sonine Formula
- Weber's Theorem
- Web Graph
- Wedderburn's Theorem
- Weddle's Rule