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Determine whether set is closed, open or neither.

  1. Jan 24, 2015 #1

    MechanicalBrank

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    1. The problem statement, all variables and given/known data
    D1 = {(x,y) : x^2 + y^2 < 3, x+2y = 2}
    D2={(x,y) : x^2 + y^2 > 2}
    D3={(x,y) : x + 2y = 2}
    2. Relevant equations


    3. The attempt at a solution
    D1 is neither, D2 is open and D3 is closed, am I right or wrong?
     
    MechanicalBrank, Jan 24, 2015
  2. jcsd
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  3. Jan 24, 2015 #2

    PeroK

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    Right!
     
    PeroK, Jan 24, 2015
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