---

Step * of Lemma sg-inv-inv

∀[sg:s-Group]. ∀[x:Point].  x^-1^-1 ≡ x
BY
{ (Auto THEN BLemma `sg-inv-unique` THEN Auto) }

---

Latex:

---

Latex:
\mforall{}[sg:s-Group].  \mforall{}[x:Point].    x\^{}-1\^{}-1  \mequiv{}  x


By

---

Latex:
(Auto  THEN  BLemma  `sg-inv-unique`  THEN  Auto)

---

Home Index