On 7/12/2012 3:10 PM, Julian Bradfield wrote:
If you read any introduction to TeX, it will explain how you use macros to provide a structured markup. If you were using that notation, then you would define a suitable macro, say \def\tetration#1#2{{}^{#2}{#1}} and write $\tetration{y}{x}$. This does not depend on any fancy Unicodery for its interpretation, and also allows you to define semantic content for the computer.
But that's like a private use character - fat chance of exchanging that with anybody not using the same software suite.
A./
