Kollros' Theorem
For every ring containing 
Spheres, there exists a ring of 
Spheres, each touching each of the Spheres, where
The Hexlet is a special case with
.See also Hexlet, Sphere
References
Honsberger, R. Mathematical Gems II. Washington, DC: Math. Assoc. Amer., p. 50, 1976.
- Constructible Number
- Constructible Polygon
- Construction
- Constructive Dilemma
- Contact Angle
- Contact Number
- Contact Triangle
- Content
- Contiguous Function
- Continued Fraction
- Continued Fraction Constant
- Continued Fraction Factorization Algorithm
- Continued Fraction Fundamental Recurrence Relation
- Continued Fraction Map
- Continued Fraction Unit Fraction Algorithm
- Continued Square Root
- Continued Vector Product
- Continuity
- Continuity Axioms
- Continuity Correction
- Continuity Principle
- Continuous
- Continuous Distribution
- Continuous Function
- Continuous Space