---

Step * of Lemma rminus-zero

-(r0) = r0
BY
{ (Auto
   THEN BLemma `req_weakening`
   THEN Auto
   THEN Symmetry
   THEN (Assert r0 ∈ ℝ BY
               Auto)
   THEN MemTypeHD (-1)
   THEN Auto
   THEN MemTypeCD
   THEN Auto) }

---

Latex:

---

Latex:
-(r0)  =  r0


By

---

Latex:
(Auto
  THEN  BLemma  `req\_weakening`
  THEN  Auto
  THEN  Symmetry
  THEN  (Assert  r0  \mmember{}  \mBbbR{}  BY
                          Auto)
  THEN  MemTypeHD  (-1)
  THEN  Auto
  THEN  MemTypeCD
  THEN  Auto)

---

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