O
Operations on tensors, [13] et seq.
Orthogonal transformations, linear, [7]
Orthogonality, conditions of, [7]
P
Path of light ray, [98]
Perihelion of Mercury, [99], [103]
Poisson's equation, [87]
Preferred systems of
co-ordinates, [8]
Pre-relativity physics, hypotheses
of, [26]
Principle of equivalence, [61]
—inertia, criticism of, [62]
Principles of conservation, [54]
R
Radius of Universe, [113]
Rank of tensor, [13]
Ray of light, path of, [98]
Reference, space of, [3]
Riemann, [68]
—tensor, [79], [82], [105]
Rods (measuring) and clocks in
motion, [38]
Rotation, [63]
S
Simultaneity, [17], [29]
Sitter, [28]
Skew-symmetrical tensor, [15]
Solar Eclipse expedition (1919), [99]
Space, concept of, [2]
—Homogeneity of, [17]
—Isotropy of, [17]
Spaces of reference, [3]
—equivalence of, [25]
Special Lorentz transformation, [34]
Spectral lines, displacement of, [97]
Straightest lines, [82]
Stress tensor, [22]
Symmetrical tensor, [15]
Systems of co-ordinates,
preferred, [8]
T
Tensor, [12] et seq., [68] et seq.
—Addition and subtraction of, [14]
—Contraction of, [14]
—Fundamental, [71]
—Multiplication of, [14]
—operations, [13] et seq.
—Rank of, [13]
—Symmetrical and
Skew-symmetrical, [15]
Tensors, formation by
differentiation, [73]
Theorem for addition of
velocities, [38]
Theorems of congruence, [3]
Theory of relativity, criticisms
of, [29]
Thirring, [109]
Time-concept, [28]
Time-space concept, [31]
Transformation, Galilean, [27]
—Linear orthogonal, [7]