New posts in ordinals

Is there a generalization of transfinite recursion that allows defining proper classes?

set-theory recursion ordinals transfinite-recursion

I want to know why $\omega \neq \omega+1$. [closed]

elementary-set-theory ordinals

If $\alpha\ne\beta$ are ordinals and $\alpha\subset\beta$ show $\alpha\in\beta$

set-theory ordinals

Indecomposable limit ordinals

set-theory ordinals

Do we get predicative ordinals above $\Gamma_0$ if we use hyperexponentiation?

elementary-set-theory ordinals

How to formalize the below solution

continuity ordinals

First uncountable ordinal

general-topology measure-theory ordinals

What is the cardinality of $\Omega$?

elementary-set-theory cardinals ordinals

Directed limits of topological spaces and embeddings

general-topology category-theory ordinals

Transitive sets: problem in proof of Lemma I.8.6 of Kunen's 'Foundations of Mathematics'

elementary-set-theory ordinals

Why are infinite cardinals limit ordinals?

elementary-set-theory cardinals ordinals

Is there an easy way in .NET to get "st", "nd", "rd" and "th" endings for numbers? [duplicate]

.net formatting date ordinals

Union of ordinals

set-theory ordinals

The structure of countable ordinals

set-theory arithmetic ordinals

An order type $\tau$ equal to its power $\tau^n, n>2$

set-theory order-theory ordinals

Ordinal interpretation of Friedman's $n$?

logic proof-writing order-theory ordinals trees

What's the definition of limit of sets(esp. ordinals) in set theory?

limits set-theory convergence-divergence ordinals

When the ordinal sum equals the Hessenberg ("natural") sum

reference-request ordinals

The preorder of countable order types

set-theory cardinals order-theory ordinals

cardinal's arithmetic

cardinals ordinals large-cardinals