contra Heidegger on dialectic
The path from logic to fundamental ontology immanent to ancient dialectic passes through logistic. From logike tekhne, or the sheer discipline of syntax, necessary questioning leads to logistike tekhne (here taken as the study of ratios themselves). Just then one has enough for dialectic: the asymmetric reversibility of the relations one is knowing to the relations of one’s knowing. And the leap into what dialectic shows, viz. its sequence of unsurpassable and intensifying dualities, is fundamental ontology if anything is.