Download or read book Projective Group Structures as Absolute Galois Structures with Block Approximation written by Dan Haran and published by American Mathematical Soc.. This book was released on 2007 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proves that a proper profinite group structure $\mathbf{G}$ is projective if and only if $\mathbf{G}$ is the absolute Galois group structure of a proper field-valuation structure with block approximation.