$$ | \{ \{ \} \} | = 0. $$
Is this true or false?
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2The set ${{}}$ has exactly one element, namely ${}$, so its cardinality is $1$. – user26486 Jun 22 '15 at 01:11
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It's not. That set contains exactly one element: {}, so its cardinality is 1, not 0.
Dasherman
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