User blog comment:Edwin Shade/The Grand List Of Transfinite Ordinals/@comment-32213734-20171130020144/@comment-32213734-20171130031830

Well, I think that αβ, where α and β are countable, can't reach Ω, so, αΩ = Ω. For uncountable β < Ω2 αβ can't reach Ω2, so, αΩ2 = Ω2. Similarly, αΩ3 = Ω3, αΩ4 = Ω4, αΩ5 = Ω5. Particularly, (ε4 + 6)Ω5 = Ω5. And, I think, Ω5 is ε number, ζ number, η number etc., so, ζΩ 5 = Ω5. Сorrect me if I'm wrong.