Paraconsistent logics may be viewed as one of the last elementsin a series of rapid developments in science in the 19th and early 20th c.,triggered by the appearance of non-Euclidean geometries. The philosophyof conventionalism, which gave a metatheoretical framework to the basicchanges involved, may also help in evaluating the truth import of logic and in determining its relation to ontology.

At the core of Heidegger's philosophy, there lies this nagging question: what is the link between language and being? Using a famous formulation by Heidegger as a guide (‘When we go to the well, when we go through the woods, we are always already going through the word “well”, through the word “woods”’), the analysis focuses on the connection Heidegger establishes between being (what woods and well ‘are’), understanding (something is understood ‘as’ woods or well), and temporality (human understanding of (...) woods and well has changed since ancient Greek times, for example). Language is both what grants things their way to matter to us and thus to ‘be’ for us to the extent that we understand them, but language is also linked to a ‘happening’ (Geschehen) or an event so that things are not bound to their Geek being or current being: things ‘become being’ (seiend werden). Language is both the means for things to materialize in historical times: ‘being woods’ or ‘being a well,’ as well as a testimony to their entry into being. This is why language in its poetic use can make beings ‘more being’ (seiender). (shrink)