Excludent
A method which can be used to solve any Quadratic Congruence. This technique relies on the fact that solving
is equivalent to finding a value
such that
Pick a few small moduli
. If mod does not make 
a quadratic residue of , then this value of maybe excluded. Furthermore, values of 
are never necessary.- Chu-Vandermonde Identity
- Chvátal's Art Gallery Theorem
- Chvátal's Theorem
- ci
- Ci
- Cigarettes
- Cin
- Circle
- Circle Caustic
- Circle-Circle Intersection
- Circle Cutting
- Circle Evolute
- Circle Inscribing
- Circle Involute
- Circle Involute Pedal Curve
- Circle Lattice Points
- Circle Lattice Theorem
- Circle Map
- Circle Method
- Circle Negative Pedal Curve
- Circle Notation
- Circle Order
- Circle Orthotomic
- Circle Packing
- Circle Pedal Curve