Which of the following subsets of R² are open? From the 5 choices, select all that apply {(x, y) : y < æ?} {(x, y) : y > e*} Z × Z {(x, y) : x > 0 and y = 0} {(x, y) : 2 < æ² + y² < 6}

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Which of the following subsets of R² are open?
From the 5 choices, select all that apply
{(x, y) : y < æ?}
{(x, y) : y > e*}
Z × Z
{(x, y) : x > 0 and y = 0}
{(x, y) : 2 < æ² + y² < 6}
Transcribed Image Text:Which of the following subsets of R² are open? From the 5 choices, select all that apply {(x, y) : y < æ?} {(x, y) : y > e*} Z × Z {(x, y) : x > 0 and y = 0} {(x, y) : 2 < æ² + y² < 6}
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