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Building an Intelligent Web: Theory and Practice
book

Building an Intelligent Web: Theory and Practice

by Pawan Lingras, Rajendra Akerkar
March 2010
Intermediate to advanced content levelIntermediate to advanced
326 pages
12h 25m
English
Jones & Bartlett Learning
Content preview from Building an Intelligent Web: Theory and Practice
“4137X˙CH04˙Akerkar” 2007/9/17 11:02 page 151 #33
4.3 Classication 151
Let us assume that the database T contains the following transactions: {a, b, c}, {a, b, d},
{a, c, d}, {a, c, e}, {a, d, e}, and {a, d, f}. Let us further assume that the items in the transaction
are ordered.
We define an equivalence relation between transactions as having two common prefixes. In
other words, two transactions are equivalent if their first two elements are the same. Now let us
define the lower and upper approximations for X, which contains transactions {a, b, c}, {a, b, d},
and {a, c, d}. The lower approximation of X will be given by {{a, b, c}, {a, ...
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Publisher Resources

ISBN: 9780763741372