# Thread: n({a,{a}, {a, {a}}}}) = 3????

1. ## n({a,{a}, {a, {a}}}}) = 3????

Hi. Sorry I'm new to set theory so I'm trying to grasp the above example:

how is n({a,{a}, {a, {a}}}}) = 3 and not 4??

2. Originally Posted by uneakbreed
Hi. Sorry I'm new to set theory so I'm trying to grasp the above example: how is n({a,{a}, {a, {a}}}}) = 3 and not 4??
The three elements of the set are ${\color{green}a}~,~{\color{red}\{a\}},~\&~{\color{ blue}\{a,\{a\}\}}$

3. well that was easy!! thanks for the explanation! i was looking at the set brackets wrong!