Algebra Consider the set (a, b) x (c, d) in R² , where (a, b)x(c, d) := {(x1, x2) E R² : a < x₁ < b, c < x2
Algebra Consider the set (a, b) x (c, d) in R² , where (a, b)x(c, d) := {(x1, x2) E R² : a < x₁ < b, c < x2
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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Question
![Algebra
Consider the set (a, b) x (c, d) in
R²
, where
(a, b)x(c, d) := {(x1, x2) E
R²
: a < x₁ < b, c < x2 <d}.
Prove that (a, b) x (c, d) is open.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb928ed39-1fe5-4df1-90b3-3ce7fa13a333%2F1647e4d3-3663-433e-a75c-91379dae946a%2Fhi2mtg8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Algebra
Consider the set (a, b) x (c, d) in
R²
, where
(a, b)x(c, d) := {(x1, x2) E
R²
: a < x₁ < b, c < x2 <d}.
Prove that (a, b) x (c, d) is open.
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