Exercise c. Ask the oracle. (Textbook problem 4.1) Suppose that we have access to an oracle who can answer the decision problem CNF-SAT. Show that, by asking her a polynomial number of questions, we can find a satisfying assignment if one exists. Hint: first describe how setting a variable gives a smaller CNF-SAT formula on the remaining variables. An "oracle" is a subroutine you can call that answers the question (in this case, whether the given CNF formula is satisfiable), but that costs no time to call.

Exercise c. Ask the oracle. (Textbook problem 4.1) Suppose that we have access to an oracle who can answer the decision problem CNF-SAT. Show that, by asking her a polynomial number of questions, we can find a satisfying assignment if one exists. Hint: first describe how setting a variable gives a smaller CNF-SAT formula on the remaining variables. An "oracle" is a subroutine you can call that answers the question (in this case, whether the given CNF formula is satisfiable), but that costs no time to call.

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

Problem 1PE

See similar textbooks

Similar questions

i need answer of all. if any answer will be skipped, your answer will be rejected. only complete answer will be accepted. b) Make a truth table for the statement ¬P ∧ (Q → P). What can youconclude about P and Q if you know the statement is true? a) Make a truth table for the statement (P ∨ Q) → (P ∧ Q). c) Make a truth table for the statement ¬P → (Q ∧ R).
Question A Locker can be opened by A and B when they are both there, as the locker has two keys, one of which is with A and other with B. C has both the keys, but he is permitted to open the locker only when B is not there. show that locker can be opened always if both A and C are there. Give boolean identify that symbolises this situation.
b) Given the following relations: A B C 1 5 7 4 9 r a TU В 8 10 6 11 S A В μ D 4 12 Find (i) the Cartesian product of r and s (rx s). (ii) the Cartesian product of r and s and then performing a selection operation on the result with the predicate r.A = s.A (Or.A-s.A (r x S)). (iii) the projection of A,C from relation r (IIA.c (r)). E 6 8
5. Find a closed form representation for the function defined recursively by f(0) = 5 and f(n+1)=2f(n)+4". Prove that your representation is correct using an inductive argument.
2
6. Let P(x) be a computable predicate. Show that if there are at least r numbers n such that P(n) 1 EX,(r) = {: || otherwise is partially computable.
please do it ASAP... I'll give you up thumb definitely
Determine whether each of the following functions f : {a,b,c,d} -> {a,b,c,d} is one-to-one and/or onto. (a) f(a) = b, f(b) = a, f(c) = b, f(d) = c (b) f(a) = b, f(b) = b, f(c) = d, f(d) = c (c) f(a) = b, f(b) = a, f(c) = c, f(d) = d (d) f(a) = d, f(b) = a, f(c) = c, f(d) = b (e) f(a) = c, f(b) = d, f(c) = a
7. Hany is a student in this class. He knows how to write programs in Python. Given that everyone who knows how to write programs in Python can get a high-paying job. Show that someone in this class can get a high-paying job using quantifiers and rules of inference.
Build a deterministic FA Ma such that L= L(Ma) = a((a+b)(a+b))*b For example, baba e La and aab e L4, but ab e La and abaaab e La.
In the following wff (attached in photo) , identify (i) the main operator, (ii) all of the free variables occurrences, and (iii) all of the non-vacuous quantifiers.