Potential Function
The term used in physics and engineering for a Harmonic Function. Potential functions are extremely useful, forexample, in electromagnetism, 
where they reduce the study of a 3-component VectorField to a 1-component Scalar Function.
- Puzzle
- P-Value
- Pyramid
- Pyramidal Frustum
- Pyramidal Number
- Pyritohedron
- Pythagoras's Constant
- Pythagoras's Theorem
- Pythagoras Tree
- Pythagorean Fraction
- Pythagorean Quadruple
- Pythagorean Square Puzzle
- Pythagorean Theorem
- Pythagorean Triad
- Pythagorean Triangle
- Pythagorean Triple
- Pépin's Test
- Pépin's Theorem
- Pólya-Burnside Lemma
- Pólya Conjecture
- Pólya Distribution
- Pólya Enumeration Theorem
- Pólya Polynomial
- Pólya's Random Walk Constants
- Pólya-Vinogradov Inequality