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21.) 0= {(x, y)/x +0 andy +0 } D=

21.) 0= {(x, y)/x +0 andy +0 } D=

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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21
•Show that the subsets of the plane are open. 18.) A = {(x,y) -1 < x < 1₁ -1 < y ≤1} 19.) B= {(x, y²ly >0} | 20.1 C = {(x₁y) |2 < x² + y ² <4} 21.) 0= {(x, y) / x +0 andy +0}
Transcribed Image Text:•Show that the subsets of the plane are open. 18.) A = {(x,y) -1 < x < 1₁ -1 < y ≤1} 19.) B= {(x, y²ly >0} | 20.1 C = {(x₁y) |2 < x² + y ² <4} 21.) 0= {(x, y) / x +0 andy +0}
Expert Solution
Step 1

We have result that a set is open if and only if its complement is closed. So we will use this result here.

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