Robert Low wrote:
> Schoenfeld wrote:
> > Suppose A was the rank-2 tensor:
> >
> >   A = [1, 2, 3]
> >       [4, 5, 6]
> >       [7, 8, 9]
> >
> > The "embedded diagonal rank-1 tensor" here is  [1, 5, 9]. What is the
> > proper name for this entity?
>
> 'Not a tensor', as another poster already told you. A rank 1 tensor
> has to be either a vector or a covector, and this is neither.

It is something relevant, but obviously there is no point continuing
discussion. Thanks for you help, please avoid any more in future