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asked in Mathematical Logic by Active (2k points)   | 132 views

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Cardinality of $\phi = 0$ because the set contains 0 elements.

Cardinality of $\{ \phi \} = 1$ , because the set contains one element (the element is empty set).

Cardinality of $\{ \{\phi\} \} = 1$, because the set cotains one element (the element is the set containing the empty set).
answered by Loyal (3.4k points)  
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