Kuratowski axiom set

1.x ≤ xᶜ x ≤ xᶜ x ≤ xᶜKC.1axiom✹
2.𝑥ᶜᶜ = 𝑥ᶜ xᶜᶜ = xᶜ xᶜᶜ = xᶜKC.2axiom✹
3.(𝑥+𝑦)ᶜ = 𝑥ᶜ+𝑦ᶜ (x+y)ᶜ = xᶜ+yᶜ (x+y)ᶜ = xᶜ+yᶜKC.3axiom✹
4.0ᶜ = 0 0ᶜ = 0 0ᶜ = 0KC.4axiom✹

تاربرگ‌های پیموده‌شده در این نشست: Philosophische Untersuchungen ⟩ On a Property of the Collection of All Real Algebraic Numbers ⟩ system ⟩ fraction ⟩ Frege's Notion of Existence ⟩ George Edward Moore