Ground expression

In mathematical logic, a ground term of a formal system is a term that does not contain any variables. Similarly, a ground formula is a formula that does not contain any variables. In first-order logic with identity, the sentence Q(a) ∨ P(b) is a ground formula, with a and b being constant symbols. A ground expression is a ground term or ground formula.

Ground expression

In mathematical logic, a ground term of a formal system is a term that does not contain any variables. Similarly, a ground formula is a formula that does not contain any variables. In first-order logic with identity, the sentence Q(a) ∨ P(b) is a ground formula, with a and b being constant symbols. A ground expression is a ground term or ground formula.