Author: zskoda Format: MarkdownItexImproved. Originally I conflated two constructions into one.
<a href="https://ncatlab.org/nlab/revision/diff/relative+spectrum/2">diff</a>, <a href="https://ncatlab.org/nlab/revision/relative+spectrum/2">v2</a>, <a href="https://ncatlab.org/nlab/show/relative+spectrum">current</a>
Improved. Originally I conflated two constructions into one.