Dang, I answered too quick. In 1978 I bought a TI-57 and wrote software to study tetration or iterated exponentiation. This was something that necessitated a co

Dang, I answered too quick. In 1978 I bought a TI-57 and wrote software to study tetration or iterated exponentiation. This was something that necessitated a computer. Soon I began to realize that I was looking at an example of chaos. I now have a web site at http://www.tetration.org http://www.tetration.org with fractals and all documenting my research on tetration.