The way to return to the correct timeline is simple: Take the dicks out.

“Scientific group” is not the applicable term. “natural group” or “monophyletic group” or “clade”, would be more… scientific

Got it , got it… writes in margin

Ichthyology ≠ Science

To approach from another angle…

Tensors are generalizations of scalars (that have no indices), vectors (that have exactly one index), and matrices (that have exactly two indices) to an arbitrary number of indices.

https://mathworld.wolfram.com/Tensor.html