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Existential fixed point logic (EFPL) is a natural fit for some applications,and the purpose of this talk is to attract attention to EFPL. The logic is alsointeresting in its own right as it has attractive properties. One of thoseproperties is rather unusual: truth of formulas can be defined (givenappropriate syntactic apparatus) in the logic. We mentioned that propertyelsewhere, and we use this opportunity to provide the proof.

One useful logic that defines its own truth