Substance and function, and Einstein's theory of relativity / Ernst Cassirer Einstein's theory of relativity. Cassirer, Ernst, 1874-1945. Swabey, William Curtis, 1894-1979. tr. Swabey, Marie Collins, 1890-1966, joint tr. Relativity (Physics) Substance (Philosophy) Knowledge, Theory of. 530.1 CAS Bibliography: p. 457-460. Chicago ; London : The Open court publishing company, C1923. C1923. 1923 Text ii-xii, 465 p. : eng