Clean
Merge branch 'develop' into chapter-diagrams
Move comparison to view
Remove comparison method. Too confusing for chapter.
Mergy
Add section on low-pass filter
Dot product
Better intro
Re-organize intro
Move low-pass filter and dot product explanations to intro
Chapter
Merge branch 'develop' into chapter-diagrams
Expand low-pass filter section;
Merge branch 'develop' into chapter-diagrams