Author: Anton Hilado Format: MarkdownItexAdded link to Drinfeld upper half-plane, and creating new page.
<a href="https://ncatlab.org/nlab/revision/diff/upper+half-plane/6">diff</a>, <a href="https://ncatlab.org/nlab/revision/upper+half-plane/6">v6</a>, <a href="https://ncatlab.org/nlab/show/upper+half-plane">current</a>
Added link to Drinfeld upper half-plane, and creating new page.