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??

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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

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