Show that P^NP ⊆ ΣP2 .Once you’ve proved the first fact, these two are easier to show, but you don’t have to show them for this exercise.) Hint: You need to simulate an oracle machine with an ∃ quantifier and a ∀ quantifier. Use the ∃ quantifier to guess oracle answers and both quantifiers to check the truthfulness of the answer.

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
Section: Chapter Questions
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Show that P^NP ⊆ ΣP2
.Once you’ve proved the first fact,
these two are easier to show, but you don’t have to show them for this exercise.)
Hint: You need to simulate an oracle machine with an ∃ quantifier and a ∀ quantifier. Use the
∃ quantifier to guess oracle answers and both quantifiers to check the truthfulness of the answer. 

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