Epistemological psychology
The term episteme is related to the Greek word επιστήμη, which translates literally as "standing near or by that which causes" but is often simplified as "knowledge" or "science". By ignoring ego interests the core impetus or the essence of a deed, real or imagined, is recovered.
Dynamic epistemic logic
Epistemic logic is a modal logic. So, what we call an epistemic model formula_73 is just a Kripke model as defined in modal logic. The set formula_74 is a non-empty set whose elements are called "possible worlds" and the "interpretation" formula_75 is a function specifying which propositional facts (such as ‘Ann has the red card’) are true in each of these worlds. The "accessibility relations" formula_76 are binary relations for each agent formula_77; they are intended to capture the uncertainty of each agent (about the actual world and about the other agents' uncertainty). Intuitively, we have formula_78 when the world formula_79 is compatible with agent formula_39’s information in world formula_81 or, in other words, when agent formula_39 considers that world formula_79 might correspond to the world formula_81 (from this standpoint). We abusively write formula_85 for formula_86 and formula_87 denotes the set of worlds formula_88.