The predicate may be followed by one or more arguments which are enclosed by parentheses. /* Rule 8 */ popo(X, Y) :- mother(X, Z), mother(Z, Y).

The arguments can be atoms (in this case, these atoms are treated as constants), numbers, variables or lists. If we consider the arguments in a fact to be objects, then the of the fact describes a property of the objects. /* Rule 9 */ is a statement starting with a predicate and probably followed by its arguments.

unification is great because you can do pattern matching with it, for example : because prolog tries to make X-Y: Z fit the expression 5-[a, b, c]:y.

LT improves profitability and reduces project risk by consolidating multiple spreadsheets, word processing files, paper-based forms, drawings and other important documents in a single, easy-to-access database.

Arguably, it's the motivation for everything you do in life - to be worthy of love. That means local offices staffed by warm, experienced, real people - not algorithms. Humans are complex, but it has worked for thousands of people like you.