#@algorithm@# 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. such as Prolog to find all possible ways of proving a 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 algorithm which can be used to implement (1995-04-13)
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