Exercise 10.18 [disjunctive-satplan-exercise]

In the $SATPlan$ algorithm in Figure satplan-agent-algorithm (page satplan-agent-algorithm), each call to the satisfiability algorithm asserts a goal $g^T$, where $T$ ranges from 0 to $T_{max}$. Suppose instead that the satisfiability algorithm is called only once, with the goal $g^0 \vee g^1 \vee \cdots \vee g^{T_{max}}$.

  1. Will this always return a plan if one exists with length less than or equal to $T_{max}$?

  2. Does this approach introduce any new spurious “solutions”?

  3. Discuss how one might modify a satisfiability algorithm such as $WalkSAT$ so that it finds short solutions (if they exist) when given a disjunctive goal of this form.

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