Special Symbols (non-vectorial). a, B, singular lines (§ 9). 7, spacial lines; 8, temporal lines (§ 9, 37). , electric charge (§ 48). material density (§ 45); ", density under no relative motion. electric density (§ 54); P, density under no relative motion. electric scalar potential (§ 48). m, mass; mo, mass under no relative motion. t, time (also x4). u, v, velocities. x, y, z, space coordinates (also X1, X2, X3). I, idemfactor. L, Lagrangian function (§ 56). R, a perpendicular interval (§ 43). Special Symbols (vectorial). a, (three-dimensional) ordinary vector potential (§ 48). c, extended curvature (§ 22, 35). e, (three-dimensional) electric force (§ 49, 50). f, (three-dimensional) mechanical force (§ 35). g, as in dg, special vector of extended momentum (§ 47). h, (three-dimensional) magnetic force (§ 49, 50). 1, extended light-vector, singular ray (§ 43). m, extended (four-dimensional) vector potential (§ 48, 55). n, unit normal to (8)-curve (§ 43). p, geometric potential vector (§ 43). q, vector of extended electric current density (§ 54). r, four-dimensional radius vector. v, (three-dimensional) velocity (§ 43). w, unit tangent to (8)-curve. E, electric 2-vector (§ 49). H, magnetic 2-vector (§ 49). M, electromagnetic 2-vector (§ 48). P, geometric 2-vector field (§ 43). S, as in ds, element of (two-dimensional) surface. S, as in d, element of three-dimensional volume. 2, as in dz, element of four-dimensional volume. 21. Mechanics of a material particle and of radiant energy 419 54. The field of continuous distributions of electricity 58. Mechanics of a material system, and gravitation 484 493 |
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