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Oracle machine
Abstract machine used to study decision problems
Oracle machine
In complexity theory and computability theory, an oracle machine is an abstract machine that can query a black box called an oracle, which is able to give an answer to any instance of a certain problem R {\displaystyle R} in a single operation. The problem R {\displaystyle R} can be of any complexity class, or it can even be an undecidable problem such as the halting problem. If another problem R ′ {\displaystyle R'} is reducible to R {\displaystyle R} in polynomial time, then the oracle machine (with the R {\displaystyle R} -oracle) can solve R ′ {\displaystyle R'} in polynomial time; one can say that R ′...
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