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18. • Show that the subsets of the plane are A = {(x,y) -1 < x < 1₁ -1

18. • Show that the subsets of the plane are A = {(x,y) -1 < x < 1₁ -1

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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18
Show that the subsets of the plane are open. 18.) A = {(xy> -1 < x < 1₁ -1 < y ≤ 1} 19.) B = {(x, y³|y >0} 20.1 (= {(x₁y) / 2 < x² + y² <4} 21.) 0= {(x, yo / x +0 and y+0} у
Transcribed Image Text:Show that the subsets of the plane are open. 18.) A = {(xy> -1 < x < 1₁ -1 < y ≤ 1} 19.) B = {(x, y³|y >0} 20.1 (= {(x₁y) / 2 < x² + y² <4} 21.) 0= {(x, yo / x +0 and y+0} у
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