Notes on on tensor notation.

Note on note 8a of the "The theory of relativity".

Note on note 8a of the "The theory of relativity".

Note with two references and calculations.

Lecture notes on Wave mechanics, 2x2 rotation matrices; spinor transformations.

Notes and reference to R. P. Durbin, H. H. Loar, and W. W. Havens, Jr., Phys. Rev. 88, 179 (1952).

References on thermodynamics.

Notes on wave mechanics.

Notes on a New York talk (Lee model, S-matrix, Hilbert space).

Quotation of Plotin and Sextus Empiricus.