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Deontic modality (abbreviated DEO) is a linguistic modality that indicates how the world ought to be [1] according to certain norms, expectations, speaker desires, etc. In other words, a deontic expression indicates that the state of the world (where 'world' is loosely defined here in terms of the surrounding circumstances) does not meet some standard or ideal, whether that standard be social ...
Epistemic modality is a sub-type of linguistic modality that encompasses knowledge, belief, or credence in a proposition. Epistemic modality is exemplified by the English modals may, might, must. However, it occurs cross-linguistically, encoded in a wide variety of lexical items and grammatical structures.
An expression like "obligatory" is said to have deontic flavor, since it discusses possibilities which are required given the laws or norms obeyed in reality. [1]: 47 (1) Agatha must be the murderer. (expressing epistemic modality) (2) Agatha must go to jail. (expressing deontic modality)
Linguists also differentiate moods into two parental irrealis categories: deontic mood and epistemic mood. Deontic mood describes whether one could or should be able to do something. An example of deontic mood is: She should/may start. On the other hand, epistemic mood describes the chance or possibility of something happening.
dynamic modality, [2] which may be distinguished from deontic modality in that, with dynamic modality, the conditioning factors are internal – the subject's own ability or willingness to act [3] The following sentences illustrate epistemic and deontic uses of the English modal verb must: epistemic: You must be starving.
For instance, in epistemic modal logic, the formula can be used to represent the statement that is known. In deontic modal logic, that same formula can represent that is a moral obligation. Modal logic considers the inferences that modal statements give rise to.
Propositional Modality can be further subdivided into Epistemic Modality [11] and; Evidential Modality. Event Modality in turn can be of two types: Deontic Modality [12] and; Dynamic Modality. In Deontic Modality, the conditioning factors are external to the relevant individual or speaker, whereas with Dynamic Modality they are internal. [13]
Epistemic modal logic is a subfield of modal logic that is concerned with reasoning about knowledge.While epistemology has a long philosophical tradition dating back to Ancient Greece, epistemic logic is a much more recent development with applications in many fields, including philosophy, theoretical computer science, artificial intelligence, economics, and linguistics.