Alterations can remove singularities

Alterations Can Remove Singularities

This note is a review of: A. J. de Jong Smoothness, semi-stability and alterations. Manuscript 1995, 39 pp.: Publications Mathématiques I.H.E.S. 83, 1996, pp. 51-93.

Alterations and resolution of singularities

Review of “ Alterations and resolution of singularities ”

The book contains a collection of articles by participants of the Working Week on Resolution of Singularities held at Obergurgl in Tirol, September 7-14, 1997. It is dedicated to Oscar Zariski, the founder of the school of algebraic geometry in the United States. During his long career as a mathematician he obtained ground-breaking results in algebra and algebraic geometry. Many years of his ca...

Can String Theory Avoid Cosmological Singularities ?

We consider the effective action for strings and describe in detail the evolution of a four dimensional homogeneous isotropic universe with matter included. We find that the evolution, which is singular in general, becomes singularity free if during certain Phase of the evolution, when the scale factor increases and the effective string coupling becomes strong, the universe is dominated by soli...

Recombination and selection can remove blaTEM alleles from bacterial populations.

We passaged cells expressing TEM-1 and TEM-12 from a single plasmid through either ampicillin or ceftazidime. We found that the combined effects of recombination and selection removed the bla(TEM-1) allele from the bacterial population when it was passaged through ceftazidime or the bla(TEM-12) allele when cultures were passaged through ampicillin.