- #1

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Suppose that [itex]w = F(x,y) [/itex] satisfies the following criteria at point A = (a,b).

[tex]\begin{cases}\exists\delta > 0\colon F\ is\ continous \forall (x,y)\in B(A,\delta)\\

\exists \frac{\partial}{\partial y}F , continous \\

F(A) = 0, F_y \neq 0\end{cases} \Rightarrow \exists y = f(x) continous[/tex]

The absolute correct definition is an utter pain to get written down, though that's not my purpose. This is enough information to be able to recognize what I am getting at. We call these things "undeveloped" or "inexplicit" functions, but I can't find anything with those keywords so it's (again) my apparent lack of vocabulary that's at work here :<