∀x∀y(Rxy→(x=y∧P x∧Qy))∧¬∃x(P x∧Qx) For the above proposition, describe (i) a model on which it is true (and explain why it is true on this model), and (ii) a model on which it is false (and explain why it is false on this model). Note: If there is no model of one of these types, explain why.

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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∀x∀y(Rxy→(x=y∧P x∧Qy))∧¬∃x(P x∧Qx)

For the above proposition, describe (i) a model on which it is true (and explain why it is true on this model), and (ii) a model on which it is false (and explain why it is false on this model).

Note: If there is no model of one of these types, explain why.

 

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