Eccentricity
A quantity defined for a Conic Section which can be given in terms of Semimajor andSemiminor Axes for an Ellipse. For an Ellipse with Semimajor Axis 
andSemiminor Axis 
,
The eccentricity can be interpreted as the fraction of the distance to the semimajor axis at which the Focus lies,
where
is the distance from the center of the Conic Section to the Focus.The table below gives the type of Conic Section corresponding to various ranges of eccentricity 
. | Curve |
 | Circle |
 | Ellipse |
 | Parabola |
 | Hyperbola |
- Computable Function
- Computable Number
- Computational Complexity
- Concatenated Number Sequences
- Concatenation
- Concave
- Concave Function
- Concentrated
- Concentric
- Concentric Circles
- Conchoid
- Conchoid of de Sluze
- Conchoid of Nicomedes
- Concho-Spiral
- Concordant Form
- Concur
- Concurrent
- Concyclic
- Condition
- Conditional Convergence
- Conditional Probability
- Condition Number
- Condom Problem
- Condon-Shortley Phase
- Conductor