Step 
*
 of Lemma 
lele_wf
∀[x,y,z:ℤ].  (x ≤ y ≤ z ∈ ℙ)
BY
 
{ Auto }
 
Latex: 
Latex:
\mforall{}[x,y,z:\mBbbZ{}].    (x  \mleq{}  y  \mleq{}  z  \mmember{}  \mBbbP{})
 By 
Latex:
Auto
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