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sasogeek

a null set and an empty set, are they the same?

  • one year ago
  • one year ago

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  1. mathteacher1729
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    Hi @sasogeek , in every context I've ever seen, null set and empty set mean the same thing. A set with no elements.

    • one year ago
  2. sasogeek
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    well we had an exam and the teacher asked which of the following options was a null set. a. b.{} c.{0} d.\(\phi \)

    • one year ago
  3. mathteacher1729
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    Heh. If I were grading this, I'd accept b or d. Perhaps your professor has a preferred notation? Here is the definition from Wolfram Mathworld: http://mathworld.wolfram.com/NullSet.html

    • one year ago
  4. sasogeek
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    i chose d though

    • one year ago
  5. sasogeek
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    so i guess i'm wrong...? since \(\phi \) denotes {} ?

    • one year ago
  6. mathteacher1729
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    To me, this is splitting hairs. I'd ask your professor if s/he has a preferred notation and go with that for future reference.

    • one year ago
  7. sasogeek
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    i asked him during the test and he said it was meant to confuse us but he'll tell us the answer next class so i look forward to questioning him tomorrow since tomorrow is the next lecture :)

    • one year ago
  8. mathteacher1729
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    Strange. Well, to each their own. For me, I try to make definitions and notation as clear as possible from day 1. ;-p But that's me.

    • one year ago
  9. sasogeek
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    hmmm oh well. i guess i'd never know which answer he's in search of unless he utters it himself. thanks for the help though :) that link helped a bit. and i appreciate your input x

    • one year ago
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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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