Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question

According to some political pundits, a person who is radical (R) is electable (E) if he/she is conservative (C), but otherwise is not electable.
1. Which of the following are correct representations of this assertion?
1.  (R∧E)⟺C
2.  R⇒(E⟺C)
3.  R⇒((C⇒E)∨¬E)
2. Which of the sentences in (a) can be expressed in Horn form?

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1. (R ∧E) ↔C
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2. R →(E ↔C)
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3. R⇒((C⇒E)∨¬E)
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