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The formulas at the top of that webpage are having trouble representing exponents.
Probably got lost when scraped up with a copy and paste from some other source.

For example:? "Note that many other manufacturers quote?AL?as nH/t2 for both types of material.?"
That should read? ?AL=nH/(t**2)? ?where t**2 is the number of turns squared.
Also:? "Ferrite:? turns = 1000 ((desired L/AL) 0.5) (where L in?mH)?"
should be? ? turns = (1000*(mH/AL))**0.5)? ?=? sqrt(1000*(mH/AL))

But otherwise, a good source of info on torroids.

Here's a very interesting writeup on the sorts stuff that?go wacky when using torroids:
? ??

Jerry, KE7ER