Re: The set of necessary FISONs

On 3/5/2025 4:22 AM, WM wrote:

On 04.03.2025 23:05, Jim Burns wrote:

ω/2 ω/10 and ω/20 follow ω?

>
No they follow Z₀ and UF.

ω = ⋃{F}
Following von Neumann,
each ordinal is the set of prior ordinals.
ω is the first non.finite ordinal.
ω is the set of all and only finite ordinals.
ω = ⋃{F}
ω/2 ω/10 and ω/20 aren't prior to ω?