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Math Help - n({a,{a}, {a, {a}}}}) = 3????

  1. #1
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    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??
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  2. #2
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    Quote Originally Posted by uneakbreed View Post
    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\}\}}
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  3. #3
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    well that was easy!! thanks for the explanation! i was looking at the set brackets wrong!
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