Helmholtz's Relationship to Kant.- The Discussion of Kant's Transcendental Aesthetic.- Axioms, Hypotheses, and Definitions.- Number and Magnitude.- Projective Metric and the Concept of Space.- Euclidean and Non-Euclidean Geometries in the Interpretation of Physical Measurements.- Non-Euclidean Geometry and Einstein's General Relativity: Cassirer's View in 1921.
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