Related papers: Discrete sets with minimal moment of inertia

The paper has been withdrawn by change of content and some errors in the examples.

This paper has been withdrawn. The authors realized that the obtained results were not new.

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

This paper has been withdrawn by the author since it contains errors.

This paper has been withdrawn

This paper has been withdrawn by the author due to an error.

This paper was withdrawn by the author due to a fatal error.

This paper has been withdrawn by the author since $U$ in Lemma 2 is in general not a subspace.

This paper is withdrawn from submission due to a critical error in the proof of main theorem.

This paper has been withdrawn by the author(s), due to a crucial error in eq. 6.

The paper has been withdrawn due to numerical error.

The paper is withdrawn. The proof has an error and it requires a different approach.

This paper has been withdrawn by the author, due an error in computing the invariance of the so(4,1) and so(3,2) "inner product."

The paper has been withdrawn

Withdrawn due to an incompleteness of the main results.

This paper has been withdrawn.

This paper has been withdrawn by the author. The statement of the Main Theorem but is wrong in general, there have been provided counterexamples. The main theorem only holds conditionally, under the finiteness statement of theorem 2.8.

This paper is withdrawn.

Major mistake. The paper has been withdrawn.

This paper has been withdrawn by the author due to a serious mistake on Lemma 2.4.