Thanks to Michael Friedman's heroic efforts, the outright distortions that governed much of our common sense concerning the logical positivists is finally beginning to fade. For example, most of us now know that the so-called "Quine-Duhem hypothesis" was explicitly (e.g. "one can hold true a proposition come what may") stated and defended by A.J. Ayer before Quine, and that Carnap was every bit as holistic. For example, the Aufbau contains the sentence, "The unit of meaning is the language as a whole." A lot of salutary reassessment of Carnap's philosophical value and standard Whig histories of analytic philosophy have taken place in light of Friedman's labors.*
One of Friedman's major contentions is that both phenomenology and logical positivism must be seen in terms of the "back to Kant" movements in Germany. Heidegger's dissertation advisors were the two dominant Southwest School neo-Kantians, Windelband and Rickert. His very first lecture series, where something like the tool analysis actually appears, is on these two thinkers. Carnap also was writing in the millieu of key Marburg School neo-Kantian Hermann Cohen.**
Friedman does not just establish various anxieties of influences, but actually provides substantive philosophical sense to the claim that twentieth century philosophy was overwhelmingly dominated by neo-Kantianism. He does not, however, do much with the fact that "back to Kant" was a rejection of German Idealism, and indeed wishes to take us back to a form of neo-Kantianism distinct from both Marburg and Southwest school, Ernst Cassirer's.
Though I find Friedman's variety of neo-Kantianism fascinating, I don't think that Cassirerian notions of the relativized a priori (and both Rorty and Brandom are doing something similar) go far enough. I am more excited about re-examining the entire German Idealist tradition in light of the fruits of positivism and phenomenology, a project I have argued in the blogosphere and in print to be at the very heart of the recent "return to metaphysics" in Continental Philosophy.
