atomic formula, 줄여서 간단히 atom
모든 원자식은 적형식,wff임.
atomic_formula =,atomic_formula .
Up: 포뮬러,formula
{
명제식,propositional_formula
propositional_formula
https://en.wikipedia.org/wiki/Propositional_formula
}
{
명제식,propositional_formula
propositional_formula
https://en.wikipedia.org/wiki/Propositional_formula
}