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Step * 1 of Lemma assoced_equiv_rel

.....assertion..... 
EquivRel(ℤ;x,y.Symmetrize(u,v.u | v;x;y))
BY
{ (Backchain ``symmetrized_preorder divides_preorder`` THEN Auto) }

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Latex:

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Latex:
.....assertion..... 
EquivRel(\mBbbZ{};x,y.Symmetrize(u,v.u  |  v;x;y))


By

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Latex:
(Backchain  ``symmetrized\_preorder  divides\_preorder``  THEN  Auto)

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