New posts in Ordinals

Willard 17R; uncountably many compact subsets of real line

An application of the Pressing Down Lemma (Part 1)

¿Is, for $1\le n<\omega ,\;(\omega+n)^{\omega}=\omega^{\omega}$?

Axiom of Choice implies Well-Ordering Principle

Commutativity of Ordinal Multiplication

The Definition of Ordinals and the Axiom of Regularity

Computing a cardinal and an ordinal

How to identify limit ordinals?

Ordinal tetration: The issue of ${}^{\epsilon_0}\omega$

Infinite Ordinal Sum