The proof of this result uses a similar technique to that used in [4].

The proof of this result is sketched by .

A proof of this result can be found in Lang's text.

For a proof of this result, see the corresponding section on the Hilbert's basis theorem page.

In 1982, R. Douady gave the full proof of this result.

The proof of this result is a simple computation.

The original 1942 proof of this result by Newman was rather complicated.

The mathematical proof of this result is given in .

Another proof of this result which relies only on two chord properties given above is as follows.

He mentioned to the audience that he didn't expect anyone in the hall to live long enough to see a proof of this final result.