Merge pull request #127 from DawievLill/wip-lecture-geometric

Geometric series lecture (WIP)

Author: jbrightuniverse

lectures/_toc.yml

@@ -26,6 +26,7 @@ parts:
 - caption: Tools and Techniques
   numbered: true
   chapters:
+  - file: tools_and_techniques/geom_series
   - file: tools_and_techniques/linear_algebra
   - file: tools_and_techniques/orth_proj
   - file: tools_and_techniques/lln_clt