Emancipation After Hegel

Continuing this post, one can see a Google book preview of the above title here. From the Introduction:

"The role of contradiction in Hegel's philosophy calls into question two pillars of traditional logic--the law of identity and the principle of noncontradiction. [...] Leibniz takes self-identity as banally true, as one of the primary truths of reason. It is so obvious that it is not informative, but one cannot dispute this law while remaining on the terrain of reason." He goes on to quote Aristotle that the law of noncontradiction "is naturally the starting point even for all other axioms."

It seems McGowan also states that the traditional Hegelian thesis-antithesis-synthesis ultimately ends with the realization that contradiction is the "absolute." And that formal thought cannot grasp this absolute. Which would of course, for me, seem akin to Derrida's differance as "a prerequisite of being," but not "a transcendental a priori truth."