Step
*
1
1
1
of Lemma
function-proper-continuous
1. I : Interval
2. f : I ⟶ℝ
3. iproper(I)
⇒ (∀x,y:{t:ℝ| t ∈ I} . ((x = y)
⇒ ((f x) = (f y))))
4. m : ℕ+
5. icompact(i-approx(I;m))
6. iproper(i-approx(I;m))
7. n : ℕ+
8. x : {x:ℝ| x ∈ i-approx(I;m)}
9. y : {x:ℝ| x ∈ i-approx(I;m)}
10. x = y
11. i-approx(I;m) ~ [left-endpoint(i-approx(I;m)), right-endpoint(i-approx(I;m))]
12. i-approx(I;m) ⊆ I
⊢ iproper(I)
BY
{ (FLemma `iproper-subinterval` [-1] THEN Auto) }
Latex:
Latex:
1. I : Interval
2. f : I {}\mrightarrow{}\mBbbR{}
3. iproper(I) {}\mRightarrow{} (\mforall{}x,y:\{t:\mBbbR{}| t \mmember{} I\} . ((x = y) {}\mRightarrow{} ((f x) = (f y))))
4. m : \mBbbN{}\msupplus{}
5. icompact(i-approx(I;m))
6. iproper(i-approx(I;m))
7. n : \mBbbN{}\msupplus{}
8. x : \{x:\mBbbR{}| x \mmember{} i-approx(I;m)\}
9. y : \{x:\mBbbR{}| x \mmember{} i-approx(I;m)\}
10. x = y
11. i-approx(I;m) \msim{} [left-endpoint(i-approx(I;m)), right-endpoint(i-approx(I;m))]
12. i-approx(I;m) \msubseteq{} I
\mvdash{} iproper(I)
By
Latex:
(FLemma `iproper-subinterval` [-1] THEN Auto)
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