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

.....assertion..... 
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
⊢ |ac| |ac| |bc| ∈ {p:Point| O_X_p} 
BY
InstLemma `eu-add-length-zero` [⌜e⌝;⌜|ac|⌝]⋅
THEN Auto }


Latex:


Latex:
.....assertion..... 
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.  |ac|  =  |ac|  +  |bc|
9.  |ab|  =  |ac|
10.  ab=ac
\mvdash{}  |ac|  +  X  =  |ac|  +  |bc|


By


Latex:
InstLemma  `eu-add-length-zero`  [\mkleeneopen{}e\mkleeneclose{};\mkleeneopen{}|ac|\mkleeneclose{}]\mcdot{}
THEN  Auto




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