Timeline for Intersection of (relativized/preimage) measure 0 with every hyperarithmetic perfect set
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
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| Jun 12, 2023 at 13:42 | answer | added | 喻 良 | timeline score: 2 | |
| Jun 9, 2023 at 3:48 | comment | added | Peter Gerdes | Note that, the existence of a non-empty $\Pi^0_2$ class 𝑋 with no hyperarithmetic member gives an example of a perfect set (any isolated branch would be of hyperarithmetic degree) where we can't hope to find any hyperarithmetic perfect tree 𝑇 with [𝑇]⊂𝑋. The question is if we can make sure 𝑋 has non-zero measure on [𝑇]. | |
| Jun 9, 2023 at 3:12 | history | edited | Peter Gerdes | CC BY-SA 4.0 |
fixed tex error
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| Jun 9, 2023 at 3:06 | history | asked | Peter Gerdes | CC BY-SA 4.0 |