Tensors

An array of numbers with a variable number of axes is known as a tensor. For example, for three axes, it is identified using three indices (i, j, k). 

The following image summaries a tensor, it describes a second-order tensor object. In a three-dimensional Cartesian coordinate system, tensor components will form the matrix:

      
Image reference is taken from tensor wiki https://en.wikipedia.org/wiki/Tensor

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