Which of the following two statements are NOT true about First-Order Logic (FOL) ?

Question

Which of the following  two statements  are  NOT true  about  First-Order Logic (FOL) ?

Accepted Answer

Its symbols are all logical symbols.

Accepted Answer

Its function symbols usually begin with words of capital letters.

Answer

Its predicates with arity 0 are called propositional variables.

Answer

Each of its predicate and function symbols has arity or the number of parameters.

Answer

Its functions with arity 0 are called constant symbols.

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