Excluded Middle Law
A law in (2-valued) Logic which states there is no third alternative to Truth or Falsehood. In other words, every statement must be either 
or not-. This fact no longer holdsin Three-Valued Logic or Fuzzy Logic.
- Nearest Neighbor Problem
- Near-Integer
- Near Noble Number
- Near-Pencil
- Necessary
- Necker Cube
- Necklace
- Needle
- Negation
- Negative
- Negative Binomial Distribution
- Negative Binomial Series
- Negative Integer
- Negative Likelihood Ratio
- Negative Pedal Curve
- Neighborhood
- Neile's Parabola
- Nephroid
- Nephroid Evolute
- Nephroid Involute
- Nerve
- Nested Hypothesis
- Nested Radical
- Net
- Net (Polyhedron)