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 & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter2: Equations And Inequalities
Section2.1: Equations
Problem 78E
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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.
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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