Step * of Lemma geo-tar-opp-side-iff

e:BasicGeometry. ∀A,B,P,Q:Point.  (geo-tar-opp-side(e;P;Q;A;B) ⇐⇒ AB ∧ AB ∧ (P leftof AB ⇐⇒ leftof BA))
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1
1. BasicGeometry
2. Point
3. Point
4. Point
5. Point
6. geo-tar-opp-side(e;P;Q;A;B)
7. leftof AB
⊢ leftof BA

2
1. BasicGeometry
2. Point
3. Point
4. Point
5. Point
6. geo-tar-opp-side(e;P;Q;A;B)
7. leftof BA
⊢ leftof AB

3
1. BasicGeometry
2. Point
3. Point
4. Point
5. Point
6. AB
7. AB
8. leftof AB  leftof BA
9. leftof AB  leftof BA
⊢ geo-tar-opp-side(e;P;Q;A;B)


Latex:


Latex:
\mforall{}e:BasicGeometry.  \mforall{}A,B,P,Q:Point.
    (geo-tar-opp-side(e;P;Q;A;B)  \mLeftarrow{}{}\mRightarrow{}  P  \#  AB  \mwedge{}  Q  \#  AB  \mwedge{}  (P  leftof  AB  \mLeftarrow{}{}\mRightarrow{}  Q  leftof  BA))


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Latex:
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