Let (a1, b1) and (a2, b2) be open intervals (a1 < b1 and a2 < b2). Show that the Cartesian product (a1,b1) × (a2, b2) is an open region.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Let (a1, b1) and (a2, b2) be open intervals (a1 < b1 and a2 < b2). Show that the Cartesian product (a1,b1) × (a2, b2) is an open region. 

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