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%ما هو (من)٪ 1 - تعريف
IN GENERAL RELATIVITY, A SET OF INTEGRAL CURVES OF A (NOWHERE VANISHING) VECTOR FIELDS
Timelike congruence; Null congruence; Vorticity tensor
Congruence (general relativity)
In general relativity, a congruence (more properly, a congruence of curves) is the set of integral curves of a (nowhere vanishing) vector field in a four-dimensional Lorentzian manifold which is interpreted physically as a model of spacetime. Often this manifold will be taken to be an exact or approximate solution to the Einstein field equation.
Tensor density
GENERALIZATION OF TENSOR FIELDS
Relative tensor; Tensor densities; Vector density
In differential geometry, a tensor density or relative tensor is a generalization of the tensor field concept. A tensor density transforms as a tensor field when passing from one coordinate system to another (see tensor field), except that it is additionally multiplied or weighted by a power W of the Jacobian determinant of the coordinate transition function or its absolute value.
Tensor product of modules
OPERATION THAT PAIRS A LEFT AND A RIGHT 𝑅‐MODULE INTO AN ABELIAN GROUP
Tensor product of modules over a ring; Exterior bundle; Relative tensor product; Tensor product of abelian groups; Balanced product; Trace map; Tensor product of complexes
In mathematics, the tensor product of modules is a construction that allows arguments about bilinear maps (e.g.
ويكيبيديا
Congruence (general relativity)
In general relativity, a congruence (more properly, a congruence of curves) is the set of integral curves of a (nowhere vanishing) vector field in a four-dimensional Lorentzian manifold which is interpreted physically as a model of spacetime. Often this manifold will be taken to be an exact or approximate solution to the Einstein field equation.
