Cassirer ignored the possibility of constitutive principles which are not synthetic apriori judgments.

Schlick also contributed a critical essay on Ernst Cassirer’s 1921 work on Einstein’s Theory of Relativity to the prestigious journal Kant-Studien (Cassirer 1921; Schlick 1979a, 322–334). In “Critical or Empiricist Interpretation of Modern Physics?” of 1921, Schlick explained that Cassirer’s argument rested on a false dichotomy. On the one hand, Cassirer’s own Logical Idealism incorporates principles for the ordering and measuring of sensations to constitute physical objects. On the other hand,