Tensor[CanonicalTensors] - create various standard tensors

Calling Sequences

      CanonicalTensors(keyword, spatial_type, signature, frameName)

Parameters

   keyword       - a keyword string, one of "Metric", "SymplecticForm", "ComplexStructure"

   spatial_type  - a string, either "bas" or "vrt", the spatial type of the tensor to be created

   signature     - required for the keyword "Metric", a pair of integers p (number of + 1), q (number of - 1) specifying the signature of the metric

   frameName     - (optional) a name or a string, the name of the manifold on which the tensor is to be defined