alethic logic

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Related to alethic logic: epistemic logic, Modal logic S5
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Noun1.alethic logic - the modal logic of necessity and possibility and contingency
modal logic - a system of logic whose formal properties resemble certain moral and epistemological concepts
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Formulating out of complaisance, or even n the absence of some principles in eontic logic, meant to control the assumption of values in the domain and the co-domain of the functions of functions, set as theses or laws in various systems, reflect a reality in theoretical or alethic logic, with respect to "truth," "falsity" and intermediate values.
There are many reductions of the (modal) deontic logic to the (theoretical) modal alethic logic (cf.