Step
*
1
2
of Lemma
proj-point-sep_defA
1. e : EuclideanParPlane
2. x : Point
3. x1 : Point
4. x ≠ x1
5. ∃m:Line. (x I m ∧ x1 # m)
⊢ ∃n:Line?. ((¬pp-sep(e;inl x;n)) ∧ pp-sep(e;inl x1;n))
BY
{ (RepeatFor 2 (D -1) THEN D 0 With ⌜inl m⌝ THEN Auto THEN RepUR ``pp-sep`` 0 THEN (D 0 THENA Auto)) }
1
1. e : EuclideanParPlane
2. x : Point
3. x1 : Point
4. x ≠ x1
5. m : Line
6. x I m
7. x1 # m
8. x # m
⊢ False
Latex:
Latex:
1. e : EuclideanParPlane
2. x : Point
3. x1 : Point
4. x \mneq{} x1
5. \mexists{}m:Line. (x I m \mwedge{} x1 \# m)
\mvdash{} \mexists{}n:Line?. ((\mneg{}pp-sep(e;inl x;n)) \mwedge{} pp-sep(e;inl x1;n))
By
Latex:
(RepeatFor 2 (D -1) THEN D 0 With \mkleeneopen{}inl m\mkleeneclose{} THEN Auto THEN RepUR ``pp-sep`` 0 THEN (D 0 THENA Auto))
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