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Intentional deletion of a file or program; Unintentional action. Accidental deletion of a file or program; Misplacement of physical storage media; Administration errors; Inability to read unknown file format; Failure. Power failure, resulting in data in volatile memory not being saved to permanent memory. Hardware failure, such as a head crash ...
The constant 1/3 is arbitrary; any x with 0 ≤ x < 1/2 would suffice. It turns out that C = NL . Notice that C , unlike its deterministic counterpart L , is not limited to polynomial time, because although it has a polynomial number of configurations it can use randomness to escape an infinite loop.
L is a subclass of NL, which is the class of languages decidable in logarithmic space on a nondeterministic Turing machine.A problem in NL may be transformed into a problem of reachability in a directed graph representing states and state transitions of the nondeterministic machine, and the logarithmic space bound implies that this graph has a polynomial number of vertices and edges, from ...
In computational complexity theory, a log space transducer (LST) is a type of Turing machine used for log-space reductions. A log space transducer, , has three tapes: A read-only input tape. A read/write work tape (bounded to at most () symbols). A write-only, write-once output tape.
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In computational complexity theory, a log-space computable function is a function : that requires only () memory to be computed (this restriction does not apply to the size of the output). The computation is generally done by means of a log-space transducer .
In computational complexity theory, a log-space reduction is a reduction computable by a deterministic Turing machine using logarithmic space. Conceptually, this means it can keep a constant number of pointers into the input, along with a logarithmic number of fixed-size integers . [ 1 ]