an implication expression of the form x -&gt; y, where x and y are itemsets  ex. {milk, diaper} -&gt; {beer}
an implication expression of the form x -&gt; y, where x and y are itemsets  ex. {milk, diaper} -&gt; {beer}
describes relationship between two itemsets. x --&gt; y - x is antecedent (lhs) - y is consequent (rhs)