Sylvester's Determinant Identity
where
is the submatrix of 
formed by the intersection of the subset 
of columns and 
of rows.- Quadrillion
- Quadriplanar Coordinates
- Quadruple
- Quadruple Point
- Quadruplet
- Quadtree
- Quantic
- Quantifier
- Quantization Efficiency
- Quantum Chaos
- Quarter
- Quarter Squares Rule
- Quartet
- Quartic Curve
- Quartic Equation
- Quartic Reciprocity Theorem
- Quartic Surface
- Quartile
- Quartile Deviation
- Quartile Range
- Quartile Skewness Coefficient
- Quartile Variation Coefficient
- Quasiamicable Pair
- Quasiconformal Map
- Quasigroup