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Step * 1 2 1 4 1 1 of Lemma qadd_grp_wf2


1. x : ℚ@i
2. y : ℚ@i
3. ↑qpositive(y - x)
⊢ (↑qpositive(y + -(x))) ∨ (x = y ∈ ℚ)
BY
{ TACTIC:(TACTIC:Unfold `qsub` -1 THEN Auto) }

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Latex:

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Latex:

1.  x  :  \mBbbQ{}@i
2.  y  :  \mBbbQ{}@i
3.  \muparrow{}qpositive(y  -  x)
\mvdash{}  (\muparrow{}qpositive(y  +  -(x)))  \mvee{}  (x  =  y)


By

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Latex:
TACTIC:(TACTIC:Unfold  `qsub`  -1  THEN  Auto)

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