The basis of [a tabular] representation is the fact … predicate. … [p. 953] Each pair in [the relation] R will be … [where 'v_i is the value of v_i before an execution of P and v_i' is the value after an execution of P.] … [p. 954] We found it useful to introduce a … [to specify that some variables do not change their values]. [The column headers specify mutually exclusive sets of values for some expression. The row headers specify the post-value of a variable. The entries specify a value or constraint of a variable under a condition.
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