Critical Idealism as Method: Ernst Cassirer and the Philosophy of Symbolic Forms

To commemorate the centenary of Ernst Cassirer's Philosophy of Symbolic Forms this essay focuses on how Cassirer in the development of a distinctive philosophical method analyzed the newest development within philosophy and science. Discussing Einstein's theory of relativity and Russell's formal logic Cassirer found tools to expand the critique of reason into a critique of culture. The course of argumentation is as follows. At the outset Cassirer's outline of the idea of The Philosophy of Symbolic Forms in the 1920 book Einstein's Theory of Relativity is presented as a reaction to the increasing distance between theoretical physics and ordinary experience. The Philosophy of Symbolic Forms can be read as an answer to an inner methodological demand within critical idealism. I encircle this motif in Cassirer's comment that Plato's idealism, understood as the dianoia of thought, is reiterated in Kant's transcendental philosophy and Herman Cohen's reception of Kant. This leads to a discussion of how Cassirer breaks away from Cohen by the positive reception of Russell's symbolic logic. Finally, I present the theory of functional concepts developed by Cassirer (1910) in the book Substance and Function as a prerequisite for the conception of a plural but systematic philosophy of symbolic forms.