Minimal necessary information about tensors is presented. Definition of a
tensor of the 2nd rank is given, and components of a tensor with respect to some basis
are considered. Algebraic and differential operations, allowing to build tensor
expressions are discussed. Some special tensors are defined. Also the eigenvalue
problem is studied.
Keywords: Antisymmetric tensor, Contraction of tensors, Divergence,
Eigenvalue problem, Gradient, Inner product, Inverse tensor, Orthogonal tensor,
Symmetric tensor, Tensor, Tensor expression, Tensor operation, Tensor rank,
Transposed tensor.