Show that any CSP that has a finite domain for each variable can be transformed into a CSP with only binary constraints. Follow these steps: Show how a single ternary constraint such as "A B

The ternary constraint is A + B = C, now to express the ternary constraint in binary, introduce a new variable AB. The domain of AB is the set of pairs of numbers from N, where N is the set of numbers.

The three binary constraints to express the ternary constraint to binary are as follows:

1• One constraint is between A and AB according to which the value of A must be equal to the first element of the pair-value value of AB.

2• Another constraint is between B and AB, according to which the value of B must be equal to second element of value of AB.

3• The sum of the pair of numbers, which means the value of AB must be equal to the value of C.

The process of induction can be used to reduce the ternary constraint to binary constraints. Suppose, there is an n-ary constraint, then this constraint can be reduced to (n – 1) ary constraints through induction. Here, the 3-ary constraint is reduced to binary by reducing the variables A, B, C to binary constraints and then the variable D is added.

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