Gyroelongated Pentagonal Pyramid
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Johnson Solid 
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- Kreisel Conjecture
- Kronecker Decomposition Theorem
- Kronecker Delta
- Kronecker Product
- Kronecker's Polynomial Theorem
- Kronecker Symbol
- Krull Dimension
- Kruskal's Algorithm
- Kruskal's Tree Theorem
- KS Entropy
- k-Statistic
- k-Subset
- k-Theory
- 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