Congruent Numbers
A set of numbers 
such that
They are a generalization of the Congruum Problem, which is the case
. For 
, the smallest solutionis |  |  | |
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See also Congruum
References
Guy, R. K. ``Congruent Number.'' §D76 in Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, pp. 195-197, 1994.
- Cyclic Quadrangle
- Cyclic Quadrilateral
- Cyclic Redundancy Check
- Cyclid
- Cyclide
- Cyclidic Coordinates
- Cycloid
- Cycloid Evolute
- Cycloid Involute
- Cycloid Radial Curve
- Cyclomatic Number
- Cyclotomic Equation
- Cyclotomic Factorization
- Cyclotomic Field
- Cyclotomic Integer
- Cyclotomic Invariant
- Cyclotomic Number
- Cyclotomic Polynomial
- Cylinder
- Cylinder Cutting
- Cylinder-Cylinder Intersection
- Cylinder Function
- Cylinder-Sphere Intersection
- Cylindrical Coordinates
- Cylindrical Equal-Area Projection