Timeline for Is there a lop-sided permutation $\pi:\mathbb{N}\to\mathbb{N}$?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 27, 2023 at 7:15 | vote | accept | Dominic van der Zypen | ||
| Aug 26, 2023 at 20:21 | comment | added | Dominic van der Zypen | What I find extra counter-intuitive about @Gro-Tsen's and CommandMaster's construction is, that $\pi^{-1}$ has the property that $d\big(\text{ex}(\pi^{-1})\big) = 0 < 1 = d\big(\text{negex}((\pi^{-1})\big)$. Counterintuitive, because "below every natural number there are only finitely many naturals, but above infinitely many". | |
| Aug 26, 2023 at 17:25 | comment | added | LSpice | Re, @CommandMaster's comment. Perhaps the acknowledgement could go in the main post? | |
| Aug 26, 2023 at 15:35 | comment | added | Gro-Tsen | Ah, it seems that Command Master came up with the same answer (in the comments) as I was typing this one. | |
| Aug 26, 2023 at 15:33 | history | answered | Gro-Tsen | CC BY-SA 4.0 |