Johnston, Adrian. Badiou, Zizek, and Political Transformations: The Cadence of Change. Northwestern University Press, 2009.
Opposing himself to what he takes to be Badiou’s position in matters ontological, Ž in his more Hegelian manner, proposes an Otherless ontology in which those dimensions Badiou seeks to capture at the level of non-being (i.e. , events as irruptions of radical newness) are to be found within the domain of being itself, a being whose internally conflicted fragility leaves it open to immanent breaks forming parts of its unstable processes of self-sundering. 137-138
Žižek refuses to maintain a sharp distinction between being and non-being (recalling that Badiou does indeed recognize such a difference to the extent that he identifies the evental as what-is-not-being-qua-being or what is other-than-being. From the Žižekian standpoint, the ordinary being of society is not to be opposed to the extraordinary event of politics — the very “substance” of the former (as an insubstantial inexistence) consists of (even if it usually works to conceal) the negativity at play in the antagonisms and clashes of the latter.