Are convex polytopes Borel sets? Suppose P &#x2282;<!-- ⊂ --> <mi mathvariant="dou

Garrett Black

Garrett Black

Answered question

2022-06-13

Are convex polytopes Borel sets? Suppose P R n is a given convex polytope, let's say by a system of linear inequalities A x b. Is that a Borel set?

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humbast2

humbast2

Beginner2022-06-14Added 21 answers

Turning my comments above into an answer: anything even vaguely polytope flavored is going to be a finite (or at worst countable) Boolean combination of closed sets hence Borel - indeed low-level Borel. To get a non-Borel set one has to do something extremely complicated.
protestommb

protestommb

Beginner2022-06-15Added 1 answers

yes cool! one follow-up question. If we have a system A x b it may define some "unbounded polytope" (I don't know how to call that thing). This is no longer closed so I am a bit unclear on how to see it is a Borel set.

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