Hello all,
while trying to repair the broken components function in the itensor package I
struggle with the concept of "indexed objects". The manual (MIT/LCS/TM-167)
pg.13 says:
,,In ITENSR a tensor is represented as an "indexed object" . This is a
function of 3 groups of indices which represent the covariant,
contravariant and derivative indices." and ,,...the symbolic function
representing the tensor".
I can't realize the existence of such function wrt to itensor.lisp. It seems,
that the currently not working function components() contains some leavings of
an old implementation of indexed objects (i.e.the properties _TEXPRS_ and
_TSUBR_ ). These properties only appear in components and they are pretty
unused... (as far as I can see)
Is there anybody out there who could give me a hint where to find informations
about the implementation of _indexed objects_ in Macsyma?
Thanks,
Wolfgang Zocher