[thesharkboy]

I just scanned the paper, and of course, there is no "longstanding flaw" in elementary calculus. The authors come up with a notation for second (and higher) derivatives that allows elementary calculus formulas to be manipulated in a straightforward way. I'm not saying it's not interesting, and maybe even useful, but they haven't found a "flaw" in calculus. This new notation may even find its way into high school and college calculus courses.

[NobleFree]

I think this, from the second paragraph, is a reasonable statement: "The flaw they discovered is one of notation. Now, you may be thinking, how can notation be wrong? Well, notation can be wrong when it implies untrue things"

[Cold Heart]

For ten posts I thought I had an excuse for calculus being difficult for me.

I guess dyslexia will still have to do.

[backwoods-engineer]

Yep, NO flaw found here, either, and I use calculus in my job as an engineer. Who thinks dy/dx is a fraction?

[scrabblehack]

I doubt it...it seems a whole lot more awkward.
I was trying to derive it by the derivative of the quotient but it doesn’t seem to work for me.