Wallis Sieve
A compact set 
with Area
created by punching a square hole of length
in the center of a square. In each of the eight squares remaining,punch out another hole of length 
, and so on.- Lenstra Elliptic Curve Method
- Leonardo's Paradox
- Leptokurtic
- Lerch's Theorem
- Lerch Transcendent
- Less
- L-Estimate
- Letter-Value Display
- Leudesdorf Theorem
- Level Curve
- Level Set
- Level Surface
- Leviathan Number
- Levi-Civita Density
- Levi-Civita Symbol
- Levi-Civita Tensor
- Levine-O'Sullivan Greedy Algorithm
- Levine-O'Sullivan Sequence
- Lew k-gram
- Lexicographic Order
- Lexis Ratio
- Lexis Trials
- L-Function
- Lg
- L'Hospital's Cubic