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Name of a concept in math analysis in English

  1. Mar 19, 2015 #1
    The concept's main theorem goes as follows:
    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 :<
  2. jcsd
  3. Mar 19, 2015 #2


    Staff: Mentor

    I think this is the Implicit Function Theorem. In English, the opposite of "explicit" is "implicit", not "inexplicit."
  4. Mar 19, 2015 #3
    much appreciated.
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