The truth conditions of various sentences we may encounter in
arguments will depend upon their meaning, and so logicians cannot completely avoid the need to provide some treatment of the meaning of these sentences. The semantics of logic refers to the approaches that logicians have introduced to understand and determine that part of meaning in which they are interested; the logician traditionally is not interested in the sentence as uttered but in the
proposition, an idealised sentence suitable for logical manipulation.
Until the advent of modern logic,
Aristotle's Organon, especially De Interpretatione, provided the basis for understanding the significance of logic. The introduction of
quantification, needed to solve the
problem of multiple generality, rendered impossible the kind of subject–predicate analysis that governed Aristotle's account, although there is a renewed interest in
term logic, attempting to find
calculi in the spirit of Aristotle's syllogisms, but with the generality of modern logics based on the quantifier.
The main modern approaches to semantics for formal languages are the following:
The archetype of model-theoretic semantics is
semantic theory of truth, based on his
T-schema, and is one of the founding concepts of
model theory. This is the most widespread approach, and is based on the idea that the meaning of the various parts of the propositions are given by the possible ways we can give a recursively specified group of interpretation functions from them to some predefined mathematical domains: an
first-order predicate logic is given by a mapping from terms to a universe of
individuals, and a mapping from propositions to the truth values "true" and "false". Model-theoretic semantics provides the foundations for an approach to the theory of meaning known as
truth-conditional semantics, which was pioneered by
Kripke semantics introduces innovations, but is broadly in the Tarskian mold.
Truth-value semantics (also commonly referred to as substitutional quantification) was advocated by
Ruth Barcan Marcus for modal logics in the early 1960s and later championed by
J. Michael Dunn,
Nuel Belnap, and Hugues Leblanc for standard first-order logic.
James Garson has given some results in the areas of adequacy for
intensional logics outfitted with such a semantics. The truth conditions for quantified formulas are given purely in terms of truth with no appeal to domains whatsoever (and hence its name truth-value semantics).
Probabilistic semantics originated from
Hartry Field and has been shown equivalent to and a natural generalization of truth-value semantics. Like truth-value semantics, it is also non-referential in nature.