diff --git a/_toc.yml b/_toc.yml
index 3c782c6db0be9d299096cf5c2609b198e1859ff8..ada67dcfe9de0ff9c6b4781a23ca51bbdd18f56e 100644
--- a/_toc.yml
+++ b/_toc.yml
@@ -7,3 +7,7 @@ parts:
- caption: Template Caption
chapters:
- file: content/template-chapter.md
+ options:
+ numbered: true
+ sections:
+ - file: content/template-subchapter.md
diff --git a/content/template-chapter.md b/content/template-chapter.md
index 0f84eb4f4dd698e155abc987a6f14cb3e054c4ce..7bd36e0f292c5405576aed30b8fa45ea7961b98f 100644
--- a/content/template-chapter.md
+++ b/content/template-chapter.md
@@ -1,9 +1,13 @@
# Template Chapter
-This is a template chapter. It contains random text.
+This is a template chapter. It contains random text and a formula to familiarise you with the structure.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent at commodo nisi. Pellentesque erat eros, eleifend quis rutrum at, consectetur in lorem. Nulla tempus ligula nec eros tincidunt, id rhoncus nunc mattis. Duis vel ornare tortor. Etiam non justo mollis nisi lacinia fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim pharetra felis scelerisque ullamcorper.
+$$
+\phi(a \bm{v} + b \bm{w}) = a \phi(\bm{v}) + b \phi(\bm{w}).
+$$ (oneformlinearity1)
+
Integer non metus interdum, consectetur neque eu, tempor dui. Nunc dictum sagittis sapien, nec accumsan augue laoreet ut. Sed posuere dui tortor, quis molestie nisl ullamcorper sed. Aenean ultrices accumsan hendrerit. Aenean sapien mi, sodales vel commodo nec, scelerisque quis ante. Vivamus placerat enim eu mauris tempor tincidunt. Donec interdum efficitur diam non porta. Proin tincidunt varius turpis, id semper metus lacinia sit amet. Aenean non volutpat libero. In facilisis bibendum arcu vitae auctor. Praesent ut est accumsan, pharetra sapien ac, blandit justo. Aliquam placerat enim dapibus urna tempus tincidunt. Sed vitae risus id nibh bibendum tincidunt. Morbi vel auctor neque.
Nulla at aliquet ipsum. Maecenas urna ante, dapibus sit amet nulla vel, iaculis imperdiet massa. Quisque aliquam leo sed placerat porttitor. Donec varius in sapien eu maximus. In tempor dolor in placerat viverra. Praesent convallis purus velit, sit amet accumsan eros molestie a. Ut semper urna rutrum, sodales ex sit amet, maximus massa. Mauris vulputate sagittis quam nec congue. Donec hendrerit orci quis est sollicitudin, id tempor sapien mattis. Aliquam aliquam nisl ut volutpat sollicitudin. In sit amet lorem sem. Aliquam auctor venenatis mauris, et lacinia mauris posuere ut. Ut id lorem neque. Mauris arcu tellus, commodo vel tempor vitae, consequat in metus. Nam massa dui, convallis nec viverra sed, commodo eu dui.
diff --git a/content/template-subchapter.md b/content/template-subchapter.md
new file mode 100644
index 0000000000000000000000000000000000000000..9c9bd0066e45bad11b6cae43c1f9df7d7ab799bc
--- /dev/null
+++ b/content/template-subchapter.md
@@ -0,0 +1,36 @@
+# Template Sub-chapter
+
+**This is a template subchapter.** Use it to familiarise yourself with the structure of chapters, subchapters and headings. It also has an image, a "note", a "hint", a "warning" and a "dropdown" down below.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent at commodo nisi. Pellentesque erat eros, eleifend quis rutrum at, consectetur in lorem. Nulla tempus ligula nec eros tincidunt, id rhoncus nunc mattis. Duis vel ornare tortor. Etiam non justo mollis nisi lacinia fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam dignissim pharetra felis scelerisque ullamcorper.
+
+## Heading 2
+Nulla at aliquet ipsum. Maecenas urna ante, dapibus sit amet nulla vel, iaculis imperdiet massa. Quisque aliquam leo sed placerat porttitor. Donec varius in sapien eu maximus. In tempor dolor in placerat viverra. Praesent convallis purus velit, sit amet accumsan eros molestie a. Ut semper urna rutrum, sodales ex sit amet, maximus massa. Mauris vulputate sagittis quam nec congue. Donec hendrerit orci quis est sollicitudin, id tempor sapien mattis. Aliquam aliquam nisl ut volutpat sollicitudin. In sit amet lorem sem. Aliquam auctor venenatis mauris, et lacinia mauris posuere ut. Ut id lorem neque. Mauris arcu tellus, commodo vel tempor vitae, consequat in metus. Nam massa dui, convallis nec viverra sed, commodo eu dui.
+
+
+```{figure} images/tudelft.png
+:name: fig:TUDelft
+TU Delft logo.
+```
+
+Maecenas ac dapibus velit. Vestibulum eu faucibus sapien. Proin a nibh eget velit sodales blandit. Praesent pellentesque mollis orci, at ornare justo ultricies quis. Integer scelerisque commodo mauris, eget interdum odio facilisis at. Praesent nisi tellus, tristique porttitor iaculis eu, feugiat sit amet elit. Praesent sed lacinia enim. In massa arcu, volutpat vel viverra vitae, varius sed lectus. Aliquam aliquam velit metus, in porttitor ex tincidunt sit amet. Quisque lobortis tellus at bibendum congue. Quisque at convallis enim. Fusce interdum tempor venenatis.
+
+```{note}
+This is a note
+```
+
+```{tip}
+This is a tip
+```
+```{warning}
+This is a warning
+```
+
+```{exercise} Dropdown
+:class: dropdown
+This is a dropdown box.
+```
+
+
+### Heading 3
+Fusce imperdiet laoreet ornare. Sed interdum convallis risus, ac porttitor risus eleifend in. Etiam ut metus blandit, posuere magna eu, aliquam justo. Praesent interdum sit amet libero non pellentesque. Curabitur a maximus tellus, eu facilisis lorem. Sed efficitur magna pretium, finibus elit vel, sodales felis. Cras mollis nunc ac lectus luctus, auctor congue libero consequat. Donec sit amet orci ac purus vehicula faucibus. Ut hendrerit dui quis turpis dignissim gravida. Duis imperdiet sapien a tellus aliquet, id condimentum nulla pretium. Nam eleifend risus non tellus porttitor, sit amet ultrices quam finibus. Morbi faucibus id dolor non congue. Nulla elementum accumsan tortor nec tempor. Vestibulum tempor vulputate velit, at consequat leo pulvinar ac. Pellentesque quam nibh, porta nec nibh nec, efficitur convallis sapien. Etiam vel interdum nisl.
diff --git a/intro.md b/intro.md
index 01327e59658be55012580cb8e59951cac224ad05..7d5a1aa3399bb22e84b8d2cc1971347a41ddcd84 100644
--- a/intro.md
+++ b/intro.md
@@ -1,10 +1,11 @@
# Open textbooks with Jupyter books
-Welcome to the Jupyter Book template for TU Delft! This template is designed to make it easy for professors to create their own custom textbooks, lecture notes, or other educational materials for their courses.
+Welcome to the Jupyter Book template for TU Delft! This template is designed to make it easy for lecturers to create their own custom textbooks, lecture notes, or other educational materials for their courses.
With Jupyter Book, you can write your content using Markdown, Jupyter Notebooks, etc., and easily organize it into chapters and sections. You can also add interactive elements like code snippets, visualizations, and quizzes to engage your students and enhance their learning experience.
-Whether you're creating a textbook from scratch or adapting existing materials, this template provides a solid starting point and customization options to fit your needs. We hope you find it useful and look forward to seeing the great educational resources you'll create with it!
+Whether you're creating a textbook from scratch or adapting existing materials, this template provides a solid starting point and customization options to fit your needs. For a more extensive example of the possiblities, see the demo book made by [Timon Idema](https://textbooks.open.tudelft.nl/textbooks/catalog/book/73).
+
This collection of examples is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
<a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a>
diff --git a/references.bib b/references.bib
index a845151cc840034a50f5fd010515d61e661f79ee..c1171e7970c8bb40b4f5929cf03c65ee6120377d 100644
--- a/references.bib
+++ b/references.bib
@@ -1,2 +1,10 @@
----
----
+@misc{Idema_2023,
+ title={Jupyter Open Textbook: Demo Book},
+ url={https://doi.org/10.59490/tb.73},
+ journal={TU Delft OPEN Textbooks},
+ publisher={TU Delft OPEN Textbooks},
+ author={Idema, Timon},
+ year={2023},
+ month={Oct}
+ }
+