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anonymous

  • one year ago

Enter the elements of the following subsets of N: {x; x>7 ∧ x >13} My answear is {x; x>7 ∧ x >13} = (13, ∞) Is that answear correct? or how should I think?

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  1. welshfella
    • one year ago
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    you are right values of x between 7 and 13 are not included because of the intersect symbol.

  2. zzr0ck3r
    • one year ago
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    But you wrote an interval, and it wants the elements in N. So we would list it like, \[\{13,14,15,16,...\}\] or \[\mathbb{N}-\{1,2,3,4,5,6,7,8,9,10,11,12,13\}\]

  3. zzr0ck3r
    • one year ago
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    interval notation implies continuum

  4. zzr0ck3r
    • one year ago
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    I think...

  5. zzr0ck3r
    • one year ago
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    or better \(\mathbb{N}\cap (13, \infty)\) ^^^thats the one

  6. welshfella
    • one year ago
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    yep I missed that

  7. zzr0ck3r
    • one year ago
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    I was thinking it would be ok if you used an interval as long as we said our universal set was the natural numbers, but I dont think that makes sense because the natural numbers do not form a system, not even a group. Maybe just make our own notation \[\mathbb{N}\cap (13, \infty)=(13,\infty)_{\mathbb{N}}\] :)

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