Timeline for Injection from $\aleph_2$ into the power set of $\mathbb{R}$
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 27, 2018 at 7:45 | comment | added | Trevor Wilson | @bof There's a surjection from $\mathbb{R}$ to $\aleph_1$, so there's a surjection from $\mathcal{P}(\mathbb{R})$ to $\mathcal{P}(\aleph_1)$, which we can compose with a surjection from $\mathcal{P}(\aleph_1)$ to $\aleph_2$. | |
| Jan 27, 2018 at 7:25 | comment | added | bof | Why is there always a surjection from $\mathcal P(\mathbb R)$ to $ \aleph_2?$ Is that supposed to be obvious? | |
| Jan 27, 2018 at 7:14 | vote | accept | Trevor Wilson | ||
| Jan 27, 2018 at 7:01 | comment | added | Asaf Karagila♦ | The problem with you people of determinacy and inner models is that you always think in terms of large cardinals and $L(\Bbb R)$ style models... But the answer is often simpler than that! :) | |
| Jan 27, 2018 at 7:00 | answer | added | Asaf Karagila♦ | timeline score: 9 | |
| Jan 27, 2018 at 3:53 | history | asked | Trevor Wilson | CC BY-SA 3.0 |