“…Parikh's mathematical facility-as well as his conviviality and generosity as a teacher and colleague-have led to a constant stream of interesting and fruitful putting-togethers and rearrangements of heretofore disparate areas of logic and the theory of "rationality": proof theory and bounded arithmetic ( [54], [62]), temporal logic and social levels ( [63], [66], Bayesian probability theory and defeasible inference ( [1]), epistemic and dynamic epistemic logic ( [67], [69]), modal, deontic, and finite information logics ( [76]), [67], [53], [3]), belief revision theory, relevance and topology ( [8], [7], [64], [12]), electoral and political theory ( [52], [17]), and even literature and life ( [71], [73]). Juxtaposing these traditions of research with one another by asking philosophical questions yields interesting accounts of tensions and presuppositions among them.…”