Step * 3 of Lemma arctan_wf1


1. ∀x:ℝ(r0 < (r1 x^2))
2. : ℝ
3. approx-arg(λ2x.full-arctan(x);1;x) ∈ {y:ℝfull-arctan(x)} 
⊢ arctan(x) ∈ {y:ℝarctangent(x)} 
BY
(Fold `arctan` (-1) THEN DoSubsume THEN Auto) }

1
1. ∀x:ℝ(r0 < (r1 x^2))
2. : ℝ
3. arctan(x) ∈ {y:ℝfull-arctan(x)} 
4. arctan(x) arctan(x) ∈ {y:ℝfull-arctan(x)} 
⊢ {y:ℝfull-arctan(x)}  ⊆{y:ℝarctangent(x)} 


Latex:


Latex:

1.  \mforall{}x:\mBbbR{}.  (r0  <  (r1  +  x\^{}2))
2.  x  :  \mBbbR{}
3.  approx-arg(\mlambda{}\msubtwo{}x.full-arctan(x);1;x)  \mmember{}  \{y:\mBbbR{}|  y  =  full-arctan(x)\} 
\mvdash{}  arctan(x)  \mmember{}  \{y:\mBbbR{}|  y  =  arctangent(x)\} 


By


Latex:
(Fold  `arctan`  (-1)  THEN  DoSubsume  THEN  Auto)




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