Step * of Lemma Euclid-Prop21

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g:EuclideanPlane. ∀a,b,c,d:Point.  (I(abc;d)  {|cd| |bd| < |ba| |ac| ∧ bac < bdc})
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1. EuclideanPlane
2. Point
3. Point
4. Point
5. Point
6. I(abc;d)
⊢ {|cd| |bd| < |ba| |ac| ∧ bac < bdc}


Latex:


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\mforall{}g:EuclideanPlane.  \mforall{}a,b,c,d:Point.    (I(abc;d)  {}\mRightarrow{}  \{|cd|  +  |bd|  <  |ba|  +  |ac|  \mwedge{}  bac  <  bdc\})


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