Step
*
1
3
1
1
of Lemma
derivative-rsqrt-function
.....antecedent.....
1. I : Interval
2. iproper(I)
3. f : I ⟶ℝ
4. f' : I ⟶ℝ
5. ∀x:{x:ℝ| x ∈ I} . (r0 < f[x])
6. ∀x,y:{x:ℝ| x ∈ I} . ((x = y)
⇒ (f'[x] = f'[y]))
7. ∀a:{a:ℝ| a ∈ I} . ∀b:{b:ℝ| (b ∈ I) ∧ (a ≤ b)} . ∃c:{t:ℝ| t ∈ [a, b]} . ∀x:{t:ℝ| t ∈ [a, b]} . (f[c] ≤ f[x])
8. d(f[x])/dx = λx.f'[x] on I
9. x : {t:ℝ| t ∈ I}
10. y : {t:ℝ| t ∈ I}
11. x = y
⊢ f[x] continuous for x ∈ I
BY
{ (FLemma `differentiable-continuous` [-4] THEN EAuto 1) }
Latex:
Latex:
.....antecedent.....
1. I : Interval
2. iproper(I)
3. f : I {}\mrightarrow{}\mBbbR{}
4. f' : I {}\mrightarrow{}\mBbbR{}
5. \mforall{}x:\{x:\mBbbR{}| x \mmember{} I\} . (r0 < f[x])
6. \mforall{}x,y:\{x:\mBbbR{}| x \mmember{} I\} . ((x = y) {}\mRightarrow{} (f'[x] = f'[y]))
7. \mforall{}a:\{a:\mBbbR{}| a \mmember{} I\} . \mforall{}b:\{b:\mBbbR{}| (b \mmember{} I) \mwedge{} (a \mleq{} b)\} .
\mexists{}c:\{t:\mBbbR{}| t \mmember{} [a, b]\} . \mforall{}x:\{t:\mBbbR{}| t \mmember{} [a, b]\} . (f[c] \mleq{} f[x])
8. d(f[x])/dx = \mlambda{}x.f'[x] on I
9. x : \{t:\mBbbR{}| t \mmember{} I\}
10. y : \{t:\mBbbR{}| t \mmember{} I\}
11. x = y
\mvdash{} f[x] continuous for x \mmember{} I
By
Latex:
(FLemma `differentiable-continuous` [-4] THEN EAuto 1)
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