I get the basic concept of set cardinality. For example if you have $A = \{3, 4, 5, 6\}$, the set cardinality would be $4$.
What I don't grasp is problems like: $A = \{a, a \{b, a \{a \}\}\}$ or $A = \{a\}$
I get the basic concept of set cardinality. For example if you have $A = \{3, 4, 5, 6\}$, the set cardinality would be $4$.
What I don't grasp is problems like: $A = \{a, a \{b, a \{a \}\}\}$ or $A = \{a\}$