Step 
*
 of Lemma 
minus_functionality_wrt_lt
∀[i,j:ℤ].  -i < -j supposing i > j
BY
 
{ Auto' }
 
Latex: 
Latex:
\mforall{}[i,j:\mBbbZ{}].    -i  <  -j  supposing  i  >  j
 By 
Latex:
Auto'
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