9.4 Matching

The process of trying to satisfy a (sub)goal involves the operation called matching. When trying to satisfy the subgoal

student(Lisa, 5).

Prolog tries to find a matching fact in the database. We will get back to the details of how matching occurs later. For now, it is sufficient to note that when trying to satisfy a (sub)goal, Prolog uses a process called "matching" to find the answer to the query.

Next

In order to understand matching, we will also need to know what a variable is. The next page introduces what variables are.


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