What is the cardinality of this set?
{p, {p}, {p, {p}}}
my answer is 1.
is it right?
no, the set has 3 elements.
the first is p
the 2nd is the set {p}
the third is the set {p,{p}}
{p, {p}, {p, {p}}}
my answer is 1.
is it right?
the first is p
the 2nd is the set {p}
the third is the set {p,{p}}