Step * 1 1 of Lemma eu-be-end-eq


1. EuclideanPlane@i'
2. Point@i
3. Point@i
4. Point@i
5. a_b_c@i
6. ab=ac@i
7. |ac| |ab| |bc| ∈ {p:Point| O_X_p} 
8. uiff(ab=ac;|ab| |ac| ∈ {p:Point| O_X_p} )
⊢ c ∈ Point
BY
Assert ⌜|ac| |ac| |bc| ∈ {p:Point| O_X_p} ⌝⋅
THEN Auto }

1
1. EuclideanPlane@i'
2. Point@i
3. Point@i
4. Point@i
5. a_b_c@i
6. ab=ac@i
7. |ac| |ab| |bc| ∈ {p:Point| O_X_p} 
8. |ac| |ac| |bc| ∈ {p:Point| O_X_p} 
9. |ab| |ac| ∈ {p:Point| O_X_p} 
10. ab=ac
⊢ c ∈ Point


Latex:


Latex:

1.  e  :  EuclideanPlane@i'
2.  a  :  Point@i
3.  b  :  Point@i
4.  c  :  Point@i
5.  a\_b\_c@i
6.  ab=ac@i
7.  |ac|  =  |ab|  +  |bc|
8.  uiff(ab=ac;|ab|  =  |ac|)
\mvdash{}  b  =  c


By


Latex:
Assert  \mkleeneopen{}|ac|  =  |ac|  +  |bc|\mkleeneclose{}\mcdot{}
THEN  Auto




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