Example 4.7.3.21. Let $\aleph _0$ be the least infinite cardinal. Then $\aleph _0$ is strongly inaccessible. That is, the collection of finite sets is closed under finite products.
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Example 4.7.3.21. Let $\aleph _0$ be the least infinite cardinal. Then $\aleph _0$ is strongly inaccessible. That is, the collection of finite sets is closed under finite products.