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Step * 1 1 of Lemma arcsine-bounds

.....wf..... 
1. x : {x:ℝ| x ∈ (r(-1), r1)} 
⊢ π/2 ∈ {b:ℝ| -(π/2) < b} 
BY
{ InstLemma `halfpi-interval-proper` [] }

1
1. x : {x:ℝ| x ∈ (r(-1), r1)} 
2. iproper((-(π/2), π/2))
⊢ π/2 ∈ {b:ℝ| -(π/2) < b} 

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Latex:

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Latex:
.....wf..... 
1.  x  :  \{x:\mBbbR{}|  x  \mmember{}  (r(-1),  r1)\} 
\mvdash{}  \mpi{}/2  \mmember{}  \{b:\mBbbR{}|  -(\mpi{}/2)  <  b\} 


By

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Latex:
InstLemma  `halfpi-interval-proper`  []

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