Can you describe an algorithm that given two context-free grammars G1 and G2 outputs YES if and only if every string generated by G1 is also generated by G2. (I.e., output YES exactly when the set of strings generated by G1 is a subset of the set of strings generated by G2.)

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
Chapter1: Introduction
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Can you describe an algorithm that given two context-free grammars G1 and G2 outputs YES if and
only if every string generated by G1 is also generated by G2. (I.e., output YES exactly
when the set of strings generated by G1 is a subset of the set of strings generated by G2.)

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