Nicola Abbagnano is an important contemporary philosopher, near the existentalist school. Abbagnano has been influenced by Husserl‘s phenomenology and by the works of Kierkegaard and Heidegger.
Abbagnano presented his philosophy of the possible the the three-volume Storia delle folosofia. Human existence must be interpreted as the series of possibilities that follow the realisation of being and every act of choice.
Not enough attention is given in modern modal logic to the meaning either of possible as distinct from potential or of contingent. Every possibility has its positive and negative aspects and there is a logical relationship between possibility and freedom, for which Abbagnano argues in Possibilita e liberta : the normative “ought-to-be” is the moral equivalent of the empirical “may-be”.