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Step * 1 1 1 of Lemma arcsine-bounds


1. x : {x:ℝ| x ∈ (r(-1), r1)} 
2. iproper((-(π/2), π/2))
⊢ π/2 ∈ {b:ℝ| -(π/2) < b} 
BY
{ (RepUR ``iproper left-endpoint right-endpoint endpoints i-finite`` (-1) THEN D -1 THEN Auto) }

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Latex:

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Latex:

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


By

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Latex:
(RepUR  ``iproper  left-endpoint  right-endpoint  endpoints  i-finite``  (-1)  THEN  D  -1  THEN  Auto)

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