Kind - kind of a tensor

allows one to find out what kind of tensor is an expression
  • t -any expression containing tensors, vectors, p-forms etc.
  • In the Atlas package one can declare: constants, functions, vectors, p-forms, tensors etc. Any undeclared identifier is treated as 0-form i.e. as non-constan scalar (see Types). User can construct any reasonable expressions from declared or undeclared objects.