Up-arrow notation is a notation created in 1976 by Donald Knuth.

#1788on PLDB | 48Years Old |

In mathematics, Knuth's up-arrow notation is a method of notation for very large integers, introduced by Donald Knuth in 1976. In his 1947 paper, R. L. Read more on Wikipedia...

- Tags: notation
- 1 PLDB concepts link to Up-arrow notation: Conway chained arrow notation

Example from the web:

```
2â†‘4 = 2 ^ 4 = 16
2â†‘â†‘4 = 2 ^ (2 ^ 4) = 65536
2â†‘â†‘â†‘4 = 2 ^ (2 ^ (2 ^ 4)) = 2 ^ 65536
```