Author: Urs Format: MarkdownItexadded pointer to the preprint [Scharf 13](https://ncatlab.org/nlab/show/Quantum+Gauge+Theories+--+A+True+Ghost+Story#Scharf13), which is apparently what that unexpected extra chapter 6 in the latest edition of the book is based on.
<a href="https://ncatlab.org/nlab/revision/diff/Quantum+Gauge+Theories+--+A+True+Ghost+Story/5">diff</a>, <a href="https://ncatlab.org/nlab/revision/Quantum+Gauge+Theories+--+A+True+Ghost+Story/5">v5</a>, <a href="https://ncatlab.org/nlab/show/Quantum+Gauge+Theories+--+A+True+Ghost+Story">current</a>
added pointer to the preprint Scharf 13, which is apparently what that unexpected extra chapter 6 in the latest edition of the book is based on.