Discussion
What is a dead end in a planning search?
Answer: D
In domains with irreversible actions a state may be reached from which no plan exists, and a planner unable to detect that will search beneath it indefinitely. Detecting dead ends cheaply is an active research problem. Repeated states, inapplicability and thresholds are different conditions. A failure mode that arises only when actions cannot be undone is worth knowing about when choosing a planner for a domain in which they cannot.
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