Formulas
- Ore condition
- Ore extension
- Left-right planarity test
- Legendre's three-square theorem
- Orlicz sequence space
- Legendre chi function
- Legendre form
- Legendre rational functions
- Ornstein isomorphism theorem
- Oscillation (mathematics)
- Legendre sieve
- Oscillator representation
- Legendre transformation
- Legendrian knot
- Lehmer code