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


1. EuclideanPlane@i'
2. Point@i
3. Point@i
4. Point@i
5. Point@i
6. |ab| |cd| ∈ {p:Point| O_X_p} @i
⊢ b ∈ Point
BY
Assert ⌜|ab| ∈ {p:Point| O_X_p} ⌝⋅ }

1
.....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
⊢ |ab| ∈ {p:Point| O_X_p} 

2
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| ∈ {p:Point| O_X_p} 
⊢ b ∈ Point


Latex:


Latex:

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{}  a  =  b


By


Latex:
Assert  \mkleeneopen{}X  =  |ab|\mkleeneclose{}\mcdot{}




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