Given the Prolog facts in Example 28, what would Prolog...

Given the Prolog facts in Example 28, what would Prolog return when given these queries?
a) ?enrolled(kevin,ee222)
b) ?enrolled(kiko,math273)
c) ?instructor(grossman,X)
d) ?instructor(X,cs301)
e) ?teaches(X,kevin)

Key Concepts

Prolog Facts

Prolog facts are basic assertions that define relationships or properties in a Prolog program. They serve as the foundational knowledge base from which the interpreter can derive answers. Facts are stated as predicates with specific arguments and are assumed to be unconditionally true within the context of the program.

Prolog Queries

Queries in Prolog are questions asked of the knowledge base, using predicates that match the facts or rules in the program. The Prolog interpreter attempts to find values for variables in the query such that the query matches the known facts or satisfies the rules, effectively performing a search through the provided assertions.

Unification

Unification is the process by which Prolog matches terms in a query with terms in facts or rules. It involves finding an assignment for variables that makes the two terms identical, and it is the core mechanism behind how Prolog evaluates queries by breaking down and matching structures recursively.

Variable Binding

Variable binding refers to the process in Prolog where variables in queries or rules are assigned specific values during unification. Once a variable is bound to a value, that binding remains until backtracking occurs, allowing the interpreter to use these bindings to maintain consistency in the answer logic.

Backtracking

Backtracking is a control mechanism in Prolog that allows the interpreter to systematically search for alternative solutions when the current path does not lead to a successful query result. When a particular set of variable bindings fails to satisfy the query completely, Prolog will revert to previous decision points to try different possibilities, ensuring that all potential solutions are considered.

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