Planar Space
Let 
be a locally Euclidean coordinate system. Then
 | (1) |
 | (2) |
 | (3) |
 |  |  | |
 |  | (4) |
Reading off the Coefficients from
 | (5) |
 | |  | (6) |
 | |  | (7) |
 | |  | (8) |
Making a change of coordinates
gives | |  | |
|  | ||
|  | (9) | |
 | |  | |
|  | (10) | |
 | |  | (11) |
- Plus
- Plus or Minus
- Plus Perfect Number
- Plus Sign
- Plutarch Numbers
- Plücker Characteristics
- Plücker Relations
- Plücker's Conoid
- Plücker's Equations
- Pochhammer Symbol
- Pocklington-Lehmer Test
- Pocklington's Criterion
- Pocklington's Theorem
- Poggendorff Illusion
- Pohlke's Theorem
- Poincaré-Birkhoff Fixed Point Theorem
- Poincaré Conjecture
- Poincaré Duality
- Poincaré Formula
- Poincaré-Fuchs-Klein Automorphic Function
- Poincaré Group
- Poincaré-Hopf Index Theorem
- Poincaré Hyperbolic Disk
- Poincaré Manifold
- Poincaré Metric