相关论文: There are no projective surfaces in M_4

An error in Section 4 invalidates all the main results of the paper.

This paper has been withdrawn by the author due a few mistakes in the paper.

The paper has been withdrawn by the author, due to it being fundamentally flawed. The author apologizes for any inconvenience it may have caused.

This article is withdrawn because of a mistake in the main result of the paper.

This paper has been withdrawn

The paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a crucial error in equation.

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been retracted.

This paper has been withdrawn by the author, due to possible counter-examples.

withdrawn by author

This paper has been withdrawn by the author ali pourmohammad.

This paper has been withdrawn by the author(s), due a crucial sign error in Eqn. 1.

This paper has been withdrawn by the author(s), due to a crucial error in eq. 6.

This submission has been withdrawn by arXiv administrators as it is a machine-generated paper.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author.

This paper has been withdrawn due to an incorrect analysis in Section 4.

This paper has been withdrawn by the author due to a crucial sign error in equation 1.