State, giving reasons, which of the following subsets of R² are compact: (i) {(,):22 + 2 =1}. (ii) {(x, y): ry < 1}. (iii) {(x, y): e* = cos y}.

Advanced Engineering Mathematics
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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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H.W. (5)
State, giving reasons, which of the following subsets of R² are compact:
(i) {(r,u):2r2 +
=1}.
(ii) {(x, y): ry < 1}.
(iii) {(x, y): e = cos y}.
(iv) {(x,y): 0≤x≤ 1,0 ≤ y ≤ 1}.
H.W. (6) In the Euclidean metric space (R". II-II), show that there exists an open cover of Bg (x;r) has no finite subcover.
H.W. (7) Let (X, d) is a discrete metric space and YSX is an infinite set. Prove that Y is not compact in X.
Transcribed Image Text:H.W. (5) State, giving reasons, which of the following subsets of R² are compact: (i) {(r,u):2r2 + =1}. (ii) {(x, y): ry < 1}. (iii) {(x, y): e = cos y}. (iv) {(x,y): 0≤x≤ 1,0 ≤ y ≤ 1}. H.W. (6) In the Euclidean metric space (R". II-II), show that there exists an open cover of Bg (x;r) has no finite subcover. H.W. (7) Let (X, d) is a discrete metric space and YSX is an infinite set. Prove that Y is not compact in X.
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