---

Step * 2 of Lemma square-is-one


1. ∀x:ℝ. (x^2 = r1^2 ⇐⇒ (x = r1) ∨ (x = -(r1)))
⊢ ∀x:ℝ. (x^2 = r1 ⇐⇒ (x = r1) ∨ (x = -(r1)))
BY
{ (RWO "rnexp-one" (-1) THEN Auto) }

---

Latex:

---

Latex:

1.  \mforall{}x:\mBbbR{}.  (x\^{}2  =  r1\^{}2  \mLeftarrow{}{}\mRightarrow{}  (x  =  r1)  \mvee{}  (x  =  -(r1)))
\mvdash{}  \mforall{}x:\mBbbR{}.  (x\^{}2  =  r1  \mLeftarrow{}{}\mRightarrow{}  (x  =  r1)  \mvee{}  (x  =  -(r1)))


By

---

Latex:
(RWO  "rnexp-one"  (-1)  THEN  Auto)

---

Home Index