Step * 2 1 of Lemma eu-sum-eq-x

.....assertion..... 
1. EuclideanPlane@i'
2. Point@i
3. Point@i
4. Point@i
5. Point@i
6. |ab| |cd| ∈ {p:Point| O_X_p} @i
⊢ |cd| ≤ X
BY
InstLemma `eu-add-length-comm` [⌜e⌝;⌜|ab|⌝;⌜|cd|⌝]⋅
THEN Auto }

1
1. EuclideanPlane@i'
2. Point@i
3. Point@i
4. Point@i
5. Point@i
6. |ab| |cd| ∈ {p:Point| O_X_p} @i
7. |ab| |cd| |cd| |ab| ∈ {p:Point| O_X_p} 
⊢ |cd| ≤ X


Latex:


Latex:
.....assertion..... 
1.  e  :  EuclideanPlane@i'
2.  a  :  Point@i
3.  b  :  Point@i
4.  c  :  Point@i
5.  d  :  Point@i
6.  X  =  |ab|  +  |cd|@i
\mvdash{}  |cd|  \mleq{}  X


By


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




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