I am looking for the original ($\varepsilon$, $\delta$)-definition of limit by Weierstrass, but I cannot find an exact quote or a reference. I saw that somewhere it was claimed that this definition was actually published in Heine's notes of Weierstrass' lectures, but I did not find any exact reference either.
Where could I check the exact formulation of Weierstrass' definition? (I guess I know the definition, I just want to be sure that this is how he formulated it.)
(To explain my interest, I am trying to find out who was that evil person who decided to use the condition $0 < |x - a| <\delta\Rightarrow|f(x) - b| <\varepsilon$ instead of $|x - a| <\delta\Rightarrow|f(x) - b| <\varepsilon$.)