Question
Sei $X$ ein kompakter metrischer Raum, Dann ist jedes $f \in C(X)$ sogar gleichmäBig stetig. d.h., zu jedem $\varepsilon>0$ gibt es ein $\delta>0$, so daß für alle $x, y \in X$ mit $d(x, y)<\delta$ stets $|f(x)-f(v)|<e$ susfallt.
Step 1
We are given that X is a compact metric space, which means that it is complete (every Cauchy sequence converges) and totally bounded (for any ε > 0, there exists a finite cover of X by open balls of radius ε). Show more…
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(a) Let $V=x^{3}$. Find $d V$ and $\Delta V$. Show that for small values of $x$, the difference $\Delta V-d V$ is very small in the sense that there exists $\varepsilon$ such that $\Delta V-d V=\varepsilon \Delta x$, where $\varepsilon \rightarrow 0$ as $\Delta x \rightarrow 0$ (b) Generalize this result by showing that if $y=f(x)$ is a differentiable function, then $\Delta y-d y=\varepsilon \Delta x$, where $\varepsilon \rightarrow 0$ as $\Delta x \rightarrow 0$.
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