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December 22, 2018 05:42
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Learn Prolog Now! - Chapter 3 - Exercise 3.4 - X > Y?
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| % greater_than/2 - Given 2 natural numbers X, Y (as defined by Peano's axioms), is X > Y. | |
| % Basis: The successor of any natural number must be greater than 0 | |
| greater_than(succ(_), 0). | |
| % Inductive step: if X > Y, then succ(X) > succ(Y) | |
| greater_than(succ(X), succ(Y)) :- greater_than(X, Y). |
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