External Path Length -- from Wolfram MathWorld
The sum over all external (square) nodes of the lengths of the paths from the root of an extended binary tree to each node. For example, in the tree above, the external path length is 25 (Knuth 1997, pp. 399-400). The internal and external path lengths are related by E=I+2n, where n is the number of internal nodes.
Great circle - Wikipedia
Huffman Coding -- from Wolfram MathWorld
Cross Product -- from Wolfram MathWorld
Equal Parallelians Point -- from Wolfram MathWorld
Angle Bisector -- from Wolfram MathWorld
Graph Path -- from Wolfram MathWorld
Graph Path -- from Wolfram MathWorld
![](https://i0.wp.com/fourweekmba.com/wp-content/uploads/2019/01/stephen-wolfram-wolfram-alpha.png?fit=2560%2C2081&ssl=1)
Wolfram Alpha: The Physicist Turned a Successful Entrepreneur - FourWeekMBA
![](https://upload.wikimedia.org/wikipedia/commons/8/86/Logarithmic_spiral_arc_length.gif)
upload.wikimedia.org/wikipedia/commons/8/86/Logari
Tutte Polynomial -- from Wolfram MathWorld
Huffman Coding -- from Wolfram MathWorld