Consider the following subsets of the Euclidean plane R²: A = {(r.v) € R°| - 3

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Consider the following subsets of the Euclidean plane R?:
A = {(7.v) € R| - 3<33, 03ys8};
Az = {(r.v) e R* |y= r-};
A, = {(r. v) € R* | 5e* +7y" <11}.
y = x -I
+ Tgl < 1}.
(a) Which of the sets A1, A2, A3 CR? are open?
(b) Which of the sets A1, A2, A, CR are closed?
(c) Which of the sets A1, A2, Az C R? are compact?
(Justify your answers concisely.)
Transcribed Image Text:Consider the following subsets of the Euclidean plane R?: A = {(7.v) € R| - 3<33, 03ys8}; Az = {(r.v) e R* |y= r-}; A, = {(r. v) € R* | 5e* +7y" <11}. y = x -I + Tgl < 1}. (a) Which of the sets A1, A2, A3 CR? are open? (b) Which of the sets A1, A2, A, CR are closed? (c) Which of the sets A1, A2, Az C R? are compact? (Justify your answers concisely.)
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