Francesco Bonazzi

http://docs.sympy.org/latest/modules/tensor/array.html

> well my problem in python is how acces to other dimentions without use this Array[a][b][c], to automated this i think we need some mere flexible access. It's advisable to...

> if no one is working on this, can I? We need to decide what to do first.

> Perhaps the **mul** method could exist in the Tensor class. It could take a scalar and a tensor or two tensors. I think that the contracted product would be...

`Tensor.__mul__` creates a `TensMul` object. It does just that. `TensMul` is equivalent to `Mul`, except that it also handles index contraction and provides an API to inspect/handle indices of its...

If an array is associated to `A(m)`, when retrieving the array from `TensMul(a, A(m))`, the array gets multiplied by `a`.

Also, if you specify the array for `A(m)`, you cannot retrieve the array of `A(-m)`, unless a metric array has been associated to the index type of `m`.

> all uses of `__mul__` for `NDimArray` are deprecated except multiplication by a scalar It's not deprecated, it has never been implemented. The problem is that the matrix multiplication operation...

I have experimented `python -m trace -t run_script.py` today, but the output is enormous. The intention was to diff between the outputs of two different branches, but I guess the...

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