A linear transformation brings us back to the case in which......
The solutions can be carried back to H(V) with the aid of the mapping function φ.
......(a result that dates back to a 1915 paper of Hadamard)
This idea goes back at least as far as .
This argument goes back to Banach.
We now transfer the above analysis back to M(A).
We now turn back to our main question.