What is decider? - Computer Science Stack Exchange Intuitively, a decider should be a Turing machine that given an input, halts and either accepts or rejects, relaying its answer in one of many equivalent ways, such as halting at an ACCEPT or REJECT state, or leaving its answer on the output tape A similar concept is a total Turing machine, which is a machine that halts on every input
Turing Machines: What is the difference between recognizing, deciding . . . See comment on OP's answer here, then the answer by Jan Hudec : What is the difference between a TM accepting and deciding a language? I have also seen the definition of total decider to mean, the Turing machine halts on all inputs Is this all inputs in the language the Turing Machine is defined over?
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complexity theory - Confused about the concept of deciding in . . . In the definitions that I have seen, the only way for a (decider) TM to halt is to reach either the accepting or the rejecting state Here is a source: Bovet, Crescenzi Introduction to the theory of complexity
turing machines - Whats the difference between an oracle and a decider . . . This is in fact the key difference An oracle doesn’t have an implementation, it is just a black box giving answer to any particular question (most importantly, the ones we cannot answer), whereas a decider has to be well defined Turing machine In other words, we must know how a decider gets the answer, meaning it cannot answer any question
turing machines - Visualizing a Non Deterministic Decider - Computer . . . Further, I also know that a Decider is a TM that halts on all possible inputs Now, my question is how can I visualize a Non determistic Decider? Does a non-determistic decider mean a TM where All the copies must halt, (OR) At-least one copy halts Kindly explain in detail why so Thanks
Undecidability of TMs recognizing a decidable language We're aiming to solve the $\overline {A}_ {TM}$ problem ("Does M loop forever on input w?") using a subroutine for solving the decider problem ("Is M a Turing machine with a decidable language?")
Confused about definition of a non-deterministic decider Fallowing are some definitions from book quot;introduction to theory of computation quot; by sipser a nondeterministic turing machine is a decider if all its computation branches halt on all inp
Prove that the set of recursive languages is infinite For people who are wondering why there are infintely many deciders , take a decider D and keep on adding some useless states, transitions, tape symbols so that you get new decider with a larger description than D and since you can continue this process indefinitely , there exists infinitely many deciders for a recursive language