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Step * 1 of Lemma geo-le-zero

.....assertion..... 
1. e : BasicGeometry
2. p : Length
⊢ 0 = |XX| ∈ Length
BY
{ Auto }

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Latex:

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Latex:
.....assertion..... 
1.  e  :  BasicGeometry
2.  p  :  Length
\mvdash{}  0  =  |XX|


By

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Latex:
Auto

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