Step
*
1
1
4
of Lemma
geo-line-eq-to-col
1. g : EuclideanPlane
2. x : Point
3. y : Point
4. l2 : x ≠ y
5. x1 : Point
6. y1 : Point
7. m2 : x1 ≠ y1
8. <x, y, l2> ≡ <x1, y1, m2>
9. ¬x # x1y1
10. Colinear(x;x1;y1)
⊢ Colinear(x;y;y1)
BY
{ ((gSeparatedCasesLSep ⌜y⌝⌜x1⌝⌜y1⌝⋅ THEN Auto)
THEN (D 8 THEN Unfold `geo-line-sep` 0 THEN Reduce 0)
THEN InstConcl [⌜y⌝]⋅
THEN Auto) }
Latex:
Latex:
1. g : EuclideanPlane
2. x : Point
3. y : Point
4. l2 : x \mneq{} y
5. x1 : Point
6. y1 : Point
7. m2 : x1 \mneq{} y1
8. <x, y, l2> \mequiv{} <x1, y1, m2>
9. \mneg{}x \# x1y1
10. Colinear(x;x1;y1)
\mvdash{} Colinear(x;y;y1)
By
Latex:
((gSeparatedCasesLSep \mkleeneopen{}y\mkleeneclose{}\mkleeneopen{}x1\mkleeneclose{}\mkleeneopen{}y1\mkleeneclose{}\mcdot{} THEN Auto)
THEN (D 8 THEN Unfold `geo-line-sep` 0 THEN Reduce 0)
THEN InstConcl [\mkleeneopen{}y\mkleeneclose{}]\mcdot{}
THEN Auto)
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