---

Step * of Lemma square-rless-1-iff

∀x:ℝ. (x^2 < r1 ⇐⇒ |x| < r1)
BY
{ Auto }

1
1. x : ℝ
2. x^2 < r1
⊢ |x| < r1

2
1. x : ℝ
2. |x| < r1
⊢ x^2 < r1

---

Latex:

---

Latex:
\mforall{}x:\mBbbR{}.  (x\^{}2  <  r1  \mLeftarrow{}{}\mRightarrow{}  |x|  <  r1)


By

---

Latex:
Auto

---

Home Index