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Lesson progress

What has changed in the lessons, course by course, and when. The page is built from data/lesson-status.yaml and from checks the build runs on each lesson.

MATH 231

17lessons in the course
0fully done
17with every page rendering cleanly

Done so far: Renders cleanly 17 of 17, Where this fits 17 of 17, First screen redesigned 0 of 17, Rewritten to the lesson style 1 of 17, Answers checked by a script 1 of 17, Outside videos linked 0 of 17, Click and collect 0 of 17.

What shipped

  • 2026-10-04, pull request 10: A lesson progress page, linked quietly from the hub
  • 2026-10-04, pull request 9: The hub is the front page; the skill tree moves to /graph/
  • 2026-10-04, pull request 7: MATH 231 front door: What Is Linear Algebra? and the course page as a path
  • 2026-10-04, pull request 5: Lesson navigation goes back to the course page or the hub
  • 2026-10-04, pull request 3: Pass the prose gate on known findings only, and reword 6 MATH 231 sentences
  • 2026-10-04, pull request 2: Fix render errors in lesson pages and add a lesson linter

MATH 231 lessons

LessonRenders cleanlyWhere this fitsFirst screen redesignedRewritten to the lesson styleAnswers checked by a scriptOutside videos linkedClick and collectLast changed
What Is Linear Algebra?Done2026-10-04 · PR 7Done2026-10-04 · PR 7In progressPR 7Done2026-10-04 · PR 7Done2026-10-04 · PR 7Not startedNot started2026-10-04
Systems of Linear Equations and Row ReductionDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-10-04
Vector Equations and the SpanDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-06-24
The Matrix Equation Ax = bDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-10-04
Solution Sets of Linear Systems and Free VariablesDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-10-04
Linear IndependenceDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-06-24
Linear Transformations and Their MatricesDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-10-04
Matrix Operations and InvertibilityDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-06-24
The Invertible Matrix TheoremDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-10-04
DeterminantsDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-06-24
Vector Spaces and SubspacesDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-06-24
Null Space, Column Space, and BasisDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-06-24
Dimension, Rank, and Coordinate SystemsDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-10-04
Eigenvalues and EigenvectorsDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-10-04
DiagonalizationDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-10-04
Inner Products, Length, and OrthogonalityDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-06-24
Orthogonal Projections and the Gram-Schmidt ProcessDone2026-10-04 · PR 2Done2026-10-04 · PR 7Not startedNot startedNot startedNot startedNot started2026-06-24
  • First screen redesigned: What Is Linear Algebra? got a hook, key takeaways, a quick reference and the Where this fits strip in pull request 7; after reading it the owner asked for a redesign, so it is in progress.
  • Rewritten to the lesson style: Measured against docs/STYLE-FOR-LESSONS.md as it stands; a revised lesson shape is being designed.
  • Outside videos linked: Not started: the build environment's network blocked youtube.com, ocw.mit.edu, khanacademy.org and 3blue1brown.com when these links were to be added in pull request 7.