Complex Differentiable
If the Cauchy-Riemann Equations are satisfied for a function
and the Partial Derivatives of 
and 
are Continuous,then the Complex Derivative 
exists.
- Spinor
- Spiral
- Spiral Point
- Spira Mirabilis
- Spiric Section
- Spirograph
- Spirolateral
- Spline
- Splitting
- Splitting Algorithm
- Sponge
- Sporadic Group
- Sports
- Sprague-Grundy Function
- Sprague-Grundy Number
- Sprague-Grundy Value
- Spread (Link)
- Spread (Tree)
- Spun Knot
- Squarable
- Square
- Square Bracket Polynomial
- Square Cupola
- Square Curve
- Square Cutting