Kac Matrix
The 
Tridiagonal Matrix (also called the Clement Matrix)defined by
The Eigenvalues are
for 
, 1, ..., 
.- Perfect Number
- Perfect Partition
- Perfect Proportion
- Perfect Rectangle
- Perfect Ruler
- Perfect Set
- Perfect Square
- Perfect Square Dissection
- Periapsis
- Perigon
- Perimeter
- Perimeter Polynomial
- Period Doubling
- Periodic Function
- Periodic Point
- Periodic Sequence
- Period Three Theorem
- Perkins' Quilt
- Perko Pair
- Permanence of Algebraic Form
- Permanence of Mathematical Relations Principle
- Permanent
- Permil
- Permutation
- Permutation Group