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

.....assertion..... 
1. BasicGeometry
2. Point
3. |aa| X ∈ Length
4. Point
5. Point
6. Point
7. |ab| |cd| ∈ Length
⊢ |cd| ∈ Length
BY
(Assert ⌜|cd| ≤ X⌝⋅ THEN Auto THEN InstLemma `geo-le-null-segment` [⌜e⌝;⌜|cd|⌝;⌜c⌝]⋅ THEN Auto) }

1
1. BasicGeometry
2. Point
3. |aa| X ∈ Length
4. Point
5. Point
6. Point
7. |ab| |cd| ∈ Length
8. |cd| |cc| ∈ Length supposing |cd| ≤ |cc|
9. |cd| ≤ |cc| supposing |cd| |cc| ∈ Length
⊢ |cd| ≤ X

2
1. BasicGeometry
2. Point
3. |aa| X ∈ Length
4. Point
5. Point
6. Point
7. |ab| |cd| ∈ Length
8. |cd| ≤ X
9. |cd| |cc| ∈ Length supposing |cd| ≤ |cc|
10. |cd| ≤ |cc| supposing |cd| |cc| ∈ Length
⊢ |cd| ∈ Length


Latex:


Latex:
.....assertion..... 
1.  e  :  BasicGeometry
2.  a  :  Point
3.  |aa|  =  X
4.  b  :  Point
5.  c  :  Point
6.  d  :  Point
7.  X  =  |ab|  +  |cd|
\mvdash{}  X  =  |cd|


By


Latex:
(Assert  \mkleeneopen{}|cd|  \mleq{}  X\mkleeneclose{}\mcdot{}  THEN  Auto  THEN  InstLemma  `geo-le-null-segment`  [\mkleeneopen{}e\mkleeneclose{};\mkleeneopen{}|cd|\mkleeneclose{};\mkleeneopen{}c\mkleeneclose{}]\mcdot{}  THEN  Auto)




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