inverse function command

[parisse]

(10-08-2017 04:18 AM)DrD Wrote:  Incidentally, where is the greater hurt? Typical conventionally educated person, that doesn't remember unused details after education, or technology based education, wherein one immediately gains useful solutions, and can derive value instantaneously, at any point in time?

There is a high risk of replacing teaching how to do it with your brain by teaching how to press a succession of keys, where the succession of keypress will not be valid anymore in a few years because UI will have changed. This can also happen with a builtin command because the name might change, and there is a good reason why there is no universal commandname for that:
1/ there is no magic way to invert any function (solve can not solve symbolically any equation)
2/ even if solve can solve the equation, there might be several solutions, and no way to choose one.
I can extend @@ (compose power) to negative exponents by inverting a function if solve can solve the equation (choosing the first solution), but I'm not convinced it will be better.