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Homework Help: Determine whether set is closed, open or neither.

  1. Jan 24, 2015 #1
    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?
  2. jcsd
  3. Jan 24, 2015 #2


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