The kind of symbols for basic syntactic elements of first-order logic are A. Constant B. Domain C. Predicate D. Temporal E. Function Choose the correct answer from the options given below:
A, C, E only
In Russell and Norvig's presentation of first-order logic, the basic syntactic elements are the symbols that stand for objects, relations and functions. There are exactly three kinds of such symbols.
A. Constant symbols stand for objects (for example Richard, John) — a basic element.
C. Predicate symbols stand for relations (for example Brother, OnHead) — a basic element.
E. Function symbols stand for functions (for example LeftLeg) — a basic element.
B. Domain is not a symbol; it is the set of objects of a model, part of the semantics rather than the syntax.
D. Temporal is not a symbol kind of first-order logic at all; time is handled by temporal logics, which extend first-order logic.
So the elements are A, C and E. Any combination containing Domain or Temporal is wrong, which rules out the other three choices.
A, C, E only option is correct.
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