+Undecidable refers to a problem for which no [Algorithm](/wiki/algorithm) can always produce a correct yes-or-no answer for all inputs. This concept reveals fundamental limits of [Computation](/wiki/computation) and formal logical systems.
+## See also
+- [Halting Problem](/wiki/halting-problem)
+- [Incompleteness](/wiki/incompleteness)
+- [Decision Problem](/wiki/decision-problem)
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