There was a discussion on Twitter today about a mistake calculus students make:
I pointed out that it’s only off by one character:
The first equation is simply wrong. The second is correct, but a gross violation of convention, usingĀ x as a constant and e as a variable.
It’s wrong by one letter another way.
$\frac{d}{dx}e^x=e\,e^{x-1} \{=e^x\}$
Very neat. Which Twitter feed originated the discussion?
Many thanks
Jeff
Jeff: this tweet