Euler Integral
Euler integration was defined by Schanuel and subsequently explored by Rota, Chen, and Klain. The Euler integral of aFunction 
(assumed to be piecewise-constant with finitely many discontinuities) is the sum of
over the finitely many discontinuities of
. The 
-D Euler integral can be defined for classes of functions
. Euler integration is additive, so the Euler integral of 
equals the sum of the Euler integrals of and 
. See also Euler Measure- Elongated Triangular Cupola
- Elongated Triangular Dipyramid
- Elongated Triangular Gyrobicupola
- Elongated Triangular Orthobicupola
- Elongated Triangular Pyramid
- Elsasser Function
- Wilson's Primality Test
- Wilson's Theorem
- Wilson's Theorem Corollary
- Wilson's Theorem (Gauss's Generalization)
- Winding Number (Contour)
- Winding Number (Map)
- Windmill
- Window Function
- Winkler Conditions
- Winograd Transform
- Wirtinger's Inequality
- Wirtinger-Sobolev Isoperimetric Constants
- Witch of Agnesi
- Witness
- Wittenbauer's Parallelogram
- Wittenbauer's Theorem
- Witten's Equations
- Wolstenholme's Theorem
- Woodall Number