---

Step * 1 of Lemma arctangent1

.....assertion..... 
(π/r(4)) ∈ {x:ℝ| (-(π/2) < x) ∧ (x < π/2)} 
BY
{ ((MemTypeCD THEN Auto) THEN UseWitness ⌜10⌝⋅ THEN Auto) }

---

Latex:

---

Latex:
.....assertion..... 
(\mpi{}/r(4))  \mmember{}  \{x:\mBbbR{}|  (-(\mpi{}/2)  <  x)  \mwedge{}  (x  <  \mpi{}/2)\} 


By

---

Latex:
((MemTypeCD  THEN  Auto)  THEN  UseWitness  \mkleeneopen{}10\mkleeneclose{}\mcdot{}  THEN  Auto)

---

Home Index