prolog syntax prolog programs are constructed from terms constants variables or structures constants can be either atoms or numbers atoms are strings of characters starting with a lowercase letter or ...
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...Prolog syntax programs are constructed from terms constants variables or structures can be either atoms numbers strings of characters starting with a lowercase letter enclosed in apostrophes digits without decimal point and minus sign beginning an uppercase underscore consist functor function symbol which looks like atom followed by list inside parentheses separated commas interpreted as predicates relations likes john mary male sitsbetween x helen figure depicts the following structure trees person name kilgore trout date november tree nil comp semantics program is sequence statements clauses form p n where each period terminates every clause read declaratively true if procedurally to satisfy goal then pn head conjunction goals body unit fact means satisfied query consists database facts about given information conditional rules how additional info deduced sets interpreter into action bnf for contains large set predefined notational variations e g infix symbols not defined this gramma...