Klarner's Theorem
An 
Rectangle can be packed with 
strips Iff 
or 
.
References
Honsberger, R. Mathematical Gems II. Washington, DC: Math. Assoc. Amer., p. 88, 1976.
- Orthogonal Functions
- Orthogonal Group
- Orthogonal Group Representations
- Orthogonality Condition
- Orthogonality Theorem
- Orthogonal Lines
- Orthogonal Matrix
- Orthogonal Polynomials
- Orthogonal Projection
- Orthogonal Rotation Group
- Orthogonal Tensors
- Orthogonal Transformation
- Orthogonal Vectors
- Orthographic Projection
- Orthologic
- Orthonormal Basis
- Orthonormal Functions
- Orthonormal Vectors
- Orthopole
- Orthoptic Curve
- Orthotomic
- Orthotope
- Osborne's Rule
- Oscillation
- Oscillation Land