Relativity: The Special and the General Theory

accelerated according æther body of reference Cartesian co-ordinates centre chest classical mechanics co-ordinate system consideration corresponding definition distance domain dx² earth electrodynamics ellipse embankment energy equations Euclidean continuum Euclidean geometry existence experience expression finite fixed stars formulation fundamental Galileian reference-body Galileian system Gauss co-ordinate Gaussian co-ordinates gravitational field gravitational mass hold imagine inertial mass infinite laws of nature light in vacuo little rods Lorentz transformation M. N. Roy magnitude manner marble slab material points matter means measure measuring-rods and clocks mollusk Newton's observer obtain orbit physical plane position postulate of relativity principle of relativity propagation of light radius railway carriage ray of light regard rest with respect result rigid body rotating seconds of arc Section space co-ordinates space-time continuum special theory spectral lines square straight line surface system of co-ordinates theory of relativity tion tional field u-curves universe validity velocity of light x-axis