How to guess a multivariable function's PDE?

[mike3]

I have one function that i want to know how to make it and want to know where it come from. i find that tetration is a math forum, so i ask here.

However, this is specifically for tetration.

You could go somewhere else, though. Try sci.math (use Google groups if you have no other way), try something like mathforum.org, or pages like that. Just googling "math forums" gives a number of pages you could try.

@Gottfried & Tommy: To me it seems like an honest request, just misguided insofar as where he's posting it goes. I don't think calling it "spam" and making fun of it helps here, and just seems too hostile.