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Step * of Lemma halfpi-interval-proper

iproper((-(π/2), π/2))
BY
{ (RepUR ``iproper left-endpoint right-endpoint endpoints`` 0 THEN Auto) }

1
1. i-finite((-(π/2), π/2))
⊢ -(π/2) < π/2

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Latex:

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Latex:
iproper((-(\mpi{}/2),  \mpi{}/2))


By

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Latex:
(RepUR  ``iproper  left-endpoint  right-endpoint  endpoints``  0  THEN  Auto)

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