Source
A local source is a node of a Directed Graph with no entering edges, and a (global) source is a node in aDirected Graph which reaches all other nodes.
See also Directed Graph, Sink (Directed Graph)- Pedal Curve
- Pedal Line
- Pedal Point
- Pedal Triangle
- Peg Knot
- Peg Solitaire
- Peg Top
- Peirce's Theorem
- p-Element
- Pell Equation
- Pell-Lucas Number
- Pell-Lucas Polynomial
- Pell Number
- Pell Polynomial
- Pell Sequence
- Pencil
- Penrose Stairway
- Penrose Tiles
- Penrose Triangle
- Penrose Tribar
- Pentabolo
- Pentacle
- Pentacontagon
- Pentad
- Pentadecagon