one level back to Hegel (absolute idealism) 3.3.3.3.3.3.2. [Epoch of the doubt] 3.3.3.3.3.3.2.1. [Lefthegelianism] (Feuerbach, Marx) 3.3.3.3.3.3.2.2. [Existentialism] (Heidegger, Sartre) 3.3.3.3.3.3.2.3. [Logic und Analytical Philosophie] (Frege, Wittgenstein, Carnap) one level forward [Lefthegelianism] (Feuerbach, Marx) one level forward [Existentialism] (Heidegger, Sartre) one level forward [Logic und Analytical Philosophie] (Frege, Wittgenstein, Carnap)