Dual Basis
Given a Contravariant Basis 
, its dualCovariant basis is given by
where
is the Metric and 
is the mixed Kronecker Delta. In Euclidean Space with an Orthonormal Basis,
so the Basis and its dual are the same.
- k-Tuple Conjecture
- Kuen Surface
- Kuhn-Tucker Theorem
- Kuiper Statistic
- Kulikowski's Theorem
- Kummer Group
- Kummer's Conjecture
- Kummer's Differential Equation
- Kummer's Formulas
- Kummer's Function
- Kummer's Quadratic Transformation
- Kummer's Relation
- Kummer's Series
- Kummer's Series Transformation
- Kummer's Test
- Kummer's Theorem
- Kummer Surface
- Kuratowski Reduction Theorem
- Kuratowski's Closure-Component Problem
- Kuratowski's Theorem
- Kurtosis
- Kähler Manifold
- König-Egeváry Theorem
- Königsberg Bridge Problem
- König's Theorem