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.

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Intelligent Machines

Machines that use artificial intelligence to learn from the environment and past experiences to perform better in the presence of variability and uncertainty are called intelligent machines. Intelligence develops according to environment and experience. It is human-like behavior. When the computer system or any programmed machine learns from the inputs and corresponding outputs, it can be called an intelligent machine.