If α,β,γ are the cardinal numbers , then αᵝ⁺ᵞ = αᵝ.αᵞ

Описание: today I explain concept of
If α,β,γ are the cardinal numbers , then αᵝ⁺ᵞ = αᵝ.αᵞ
Advance Set Theory by I.Kaplansky
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