diff --git a/.gitignore b/.gitignore
index 605449d..2c103bf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 _freeze/
 _site/
 /.quarto/
+index_files/
+.jupyter_cache/
diff --git a/polycount/1/index.qmd b/polycount/1/index.qmd
index 6fed8c1..3c65765 100644
--- a/polycount/1/index.qmd
+++ b/polycount/1/index.qmd
@@ -5,6 +5,7 @@ format:
     html-math-method: katex
 jupyter: python3
 date: "2021/02/03"
+date-modified: "2025/02/07"
 categories:
   - algebra
   - phinary
diff --git a/polycount/2/index.qmd b/polycount/2/index.qmd
index 97cfff4..cbc9fcf 100644
--- a/polycount/2/index.qmd
+++ b/polycount/2/index.qmd
@@ -4,6 +4,7 @@ format:
   html:
     html-math-method: katex
 date: "2021/02/05"
+date-modified: "2025/02/07"
 categories:
   - algebra
   - binary
diff --git a/polycount/3/index.qmd b/polycount/3/index.qmd
index 0641bf7..8c01d96 100644
--- a/polycount/3/index.qmd
+++ b/polycount/3/index.qmd
@@ -4,6 +4,7 @@ format:
   html:
     html-math-method: katex
 date: "2021-02-06"
+date-modified: "2021-02-08"
 jupyter: python3
 categories:
   - algebra