n({a,{a}, {a, {a}}}}) = 3????

**uneakbreed** · July 31st 2009, 11:48 AM

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??

**Plato** · July 31st 2009, 12:04 PM

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 ${\color{green}a}~,~{\color{red}\{a\}},~\&~{\color{ blue}\{a,\{a\}\}}$

**uneakbreed** · July 31st 2009, 12:10 PM

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

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