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exists there is an iterative procedure which will ensure that Q will converge to Q 0 in a finite number of steps
...The iterative procedure is called the fixed increment error correction procedure
...It goes as follows:Qi Qi 1 cD if M Qi 1,D T <0 and D [[propersubset]]A Qi Qi 1 cD if M Qi 1,D T >0 and D [[propersubset]]A and no change made to Qi 1 if it diagnoses correctly
...The situation in actual retrieval is not as simple
...Once again this is not the whole story
...If M is taken to be the cosine function Q,D Q D then it is easy to show that [[Phi]]is maximised by where c is an arbitrary proportionality constant
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