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  2. Maxwell stress tensor - Wikipedia

    en.wikipedia.org/wiki/Maxwell_stress_tensor

    In this way, the above equation will be the law of conservation of momentum in classical electrodynamics; where the Poynting vector has been introduced =. in the above relation for conservation of momentum, ∇ ⋅ σ {\displaystyle {\boldsymbol {\nabla }}\cdot {\boldsymbol {\sigma }}} is the momentum flux density and plays a role similar to S ...

  3. Mohr's circle - Wikipedia

    en.wikipedia.org/wiki/Mohr's_circle

    This equation defines two values for which are apart (Figure). This equation can be derived directly from the geometry of the circle, or by making the parametric equation of the circle for τ n {\displaystyle \tau _{\mathrm {n} }} equal to zero (the shear stress in the principal planes is always zero).

  4. Tensor - Wikipedia

    en.wikipedia.org/wiki/Tensor

    More generally, if the Cartesian coordinates x, y, z undergo a linear transformation, then the numerical value of the density ρ must change by a factor of the reciprocal of the absolute value of the determinant of the coordinate transformation, so that the integral remains invariant, by the change of variables formula for integration.

  5. Covariant formulation of classical electromagnetism - Wikipedia

    en.wikipedia.org/wiki/Covariant_formulation_of...

    The covariant formulation of classical electromagnetism refers to ways of writing the laws of classical electromagnetism (in particular, Maxwell's equations and the Lorentz force) in a form that is manifestly invariant under Lorentz transformations, in the formalism of special relativity using rectilinear inertial coordinate systems.

  6. Harmonic tensors - Wikipedia

    en.wikipedia.org/wiki/Harmonic_tensors

    Formula for the tensor was considered in [11] [12] using a ladder operator. It can be derived using the Laplace operator. [14] Similar approach is known in the theory of special functions. [15] The first term in the formula, as is easy to see from expansion of a point charge potential, is equal to

  7. Tidal tensor - Wikipedia

    en.wikipedia.org/wiki/Tidal_tensor

    To calculate the differential accelerations, the results are to be multiplied by G.) Let us adopt the frame in polar coordinates for our three-dimensional Euclidean space, and consider infinitesimal displacements in the radial and azimuthal directions, ∂ r , ∂ θ , {\displaystyle \partial _{r},\partial _{\theta },} and ∂ ϕ {\displaystyle ...

  8. Voigt notation - Wikipedia

    en.wikipedia.org/wiki/Voigt_notation

    In mathematics, Voigt notation or Voigt form in multilinear algebra is a way to represent a symmetric tensor by reducing its order. [1] There are a few variants and associated names for this idea: Mandel notation, Mandel–Voigt notation and Nye notation are others found.

  9. Tensor derivative (continuum mechanics) - Wikipedia

    en.wikipedia.org/wiki/Tensor_derivative...

    The derivatives of scalars, vectors, and second-order tensors with respect to second-order tensors are of considerable use in continuum mechanics. These derivatives are used in the theories of nonlinear elasticity and plasticity, particularly in the design of algorithms for numerical simulations. [1]