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Lexikon


backtracking


A scheme for solving a series of sub-problems each of which may have multiple possible solutions and where the solution chosen for one sub-problem may affect the possible solutions of later sub-problems. To solve the overall problem, we find a solution to the first sub-problem and then attempt to recursively solve the other sub-problems based on this first solution. If we cannot, or we want all possible solutions, we backtrack and try the next possible solution to the first sub-problem and so on. Backtracking terminates when there are no more solutions to the first sub-problem. This is the algorithm used by ef="module.php?name=Lexikon&file=search&eid=1&query=logic programming">logic programming languages such as ef="module.php?name=Lexikon&file=search&eid=1&query=Prolog">Prolog to find all possible ways of proving a ef="module.php?name=Lexikon&file=search&eid=1&query=goal">goal. An optimisation known as "ef="module.php?name=Lexikon&file=search&eid=1&query=intelligent backtracking">intelligent backtracking" keeps track of the dependencies between sub-problems and only re-solves those which depend on an earlier solution which has changed. Backtracking is one ef="module.php?name=Lexikon&file=search&eid=1&query=algorithm">algorithm which can be used to implement ef="module.php?name=Lexikon&file=search&eid=1&query=nondeterminism">nondeterminism. It is effectively a ef="module.php?name=Lexikon&file=search&eid=1&query=depth-first search">depth-first search of a ef="module.php?name=Lexikon&file=search&eid=1&query=problem space">problem space. (1995-04-13)

e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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