Hello Everyone,
I want to prove the following,
`{PosInf} IN subsets Borel` or
`{x:extreal} IN subsets Borel`
Since all closed sets belong to Borel sets and all singletons are
closed sets, it should be provable. I have tried different approaches
but failed. Can someone suggest a way to prove it in HOL4?
Thank you.
Regards
Qasim
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