| podobné slovo | definícia |
nondeterministically
(encz) | nondeterministically,nedeterministicky |
complementary nondeterministic polynomial
(foldoc) | complementary nondeterministic polynomial
Co-NP
(Co-NP) The set (or property) of problems with a
yes/no answer where the complementary no/yes problem takes
nondeterministic polynomial time (NP).
For example, "Is n prime" is Co-NP and "Is n not prime" is NP,
since it is only necessary to find one factor to prove that
n is not prime whereas to prove that it is prime all possible
factors must be eliminated.
(2009-05-21)
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nondeterministic automaton
(foldoc) | nondeterministic automaton
probabilistic automaton
(Or "probabilistic automaton") An automaton in
which there are several possible actions (outputs and next
states) at each state of the computation such that the overall
course of the computation is not completely determined by the
program, the starting state, and the initial inputs.
See also nondeterministic Turing Machine.
(1996-05-07)
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nondeterministic polynomial time
(foldoc) | nondeterministic polynomial time
NP time
(NP) A set or property of computational {decision
problems} solvable by a nondeterministic Turing Machine in a
number of steps that is a polynomial function of the size of
the input. The word "nondeterministic" suggests a method of
generating potential solutions using some form of
nondeterminism or "trial and error". This may take
exponential time as long as a potential solution can be
verified in polynomial time.
NP is obviously a superset of P (polynomial time problems
solvable by a deterministic Turing Machine in {polynomial
time}) since a deterministic algorithm can be considered as a
degenerate form of nondeterministic algorithm. The question
then arises: is NP equal to P? I.e. can every problem in NP
actually be solved in polynomial time? Everyone's first guess
is "no", but no one has managed to prove this; and some very
clever people think the answer is "yes".
If a problem A is in NP and a polynomial time algorithm for A
could also be used to solve problem B in polynomial time, then
B is also in NP.
See also Co-NP, NP-complete.
[Examples?]
(1995-04-10)
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nondeterministic turing machine
(foldoc) | Nondeterministic Turing Machine
A normal (deterministic) Turing Machine that
has a "guessing head" - a write-only head that writes a guess
at a solution on the tape first, based on some arbitrary
internal algorithm. The regular Turing Machine then runs
and returns "yes" or "no" to indicate whether the solution is
correct.
A nondeterministic Turing Machine can solve
nondeterministic polynomial time computational {decision
problems} in a number of steps that is a polynomial function
of the size of the input
(1995-04-27)
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