1. ## Cardinality

I am very confused on how to answer these questions. I am supposed to find the cardinality of each of these sets.

1) non zero
2) {non zero}
3) {nonzero, {nonzero}}
4) {nonzero, {nonzero}, {nonzero, {nonzero}}}

2. Originally Posted by lm6485
I am very confused on how to answer these questions. I am supposed to find the cardinality of each of these sets.
1) non zero
2) {non zero}
3) {nonzero, {nonzero}}
4) {nonzero, {nonzero}, {nonzero, {nonzero}}}
That cannot be the complete question because as written it makes no sense whatsoever.
Non-zero what?

3. Sorry I was given the wrong problem. Instead of non zero's they are supposed to be null or empty sets.

4. Originally Posted by lm6485
Sorry I was given the wrong problem. Instead of non zero's they are supposed to be null or empty sets.
$\emptyset$ has no elements.

$\{\emptyset\}$ has one element.

$\{\emptyset,\{\emptyset\}\}$ has two elements.