Lam's Problem
Given an 
Matrix, fill 11 spaces in each row in such a way that all columns also have 11 spacesfilled. Furthermore, each pair of rows must have exactly one filled space in the same column. This problem is equivalentto finding a Projective Plane of order 10. Using a computer program, Lam showed that no such arrangementexists.
- Oscillation
- Oscillation Land
- Osculating Circle
- Osculating Curves
- Osculating Interpolation
- Osculating Plane
- Osculating Sphere
- Osedelec Theorem
- Ostrowski's Inequality
- Ostrowski's Theorem
- Otter's Tree Enumeration Constants
- Outdegree
- Outer Automorphism Group
- Outer Product
- Oval
- Oval of Descartes
- Ovals of Cassini
- Overlapping Resonance Method
- Oversampling
- Ovoid
- Paasche's Index
- Packing
- Packing Density
- p-adic Number
- Padovan Sequence