Pasch's Theorem
A theorem stated in 1882 which cannot be derived from Euclid's Postulates. Given points 
, 
, 
, and 
on aLine, if it is known that the points are ordered as 
and 
, it is also true that 
.
- Weyl's Criterion
- Weyl Tensor
- Weyrich's Formula
- W-Function
- Wheat and Chessboard Problem
- Wheel
- Wheel Graph
- Wheel Paradox
- Whewell Equation
- Whipple's Transformation
- Whirl
- Whisker Plot
- Whitehead Double
- Whitehead Link
- Whitehead Manifold
- Whitehead's Theorem
- Whitney-Graustein Theorem
- Whitney-Mikhlin Extension Constants
- Whitney Singularity
- Whitney Sum
- Whitney Umbrella
- Whittaker Differential Equation
- Whittaker Function
- Whole Number
- Width (Partial Order)