Progress of Theoretical Physics Vol. 3 No. 4 (1948) pp. 446-447 On the Hermitian Condition G. Araki Progress of Theoretical Physics Vol. 3 No. 4 (1948) pp. 448-448 On the Expectation Value G. Araki Progress of Theoretical Physics Vol. 4 No. 3 (1949) pp. 379-380 Domain of Kinetic Energy and Perturbation Theory G. Araki