# Chapter Worksheet

One page per chapter. Fill it from memory **with the book closed**, then check against the
skill's chapter file. The gap between what you wrote and what is there is the actual learning
signal — retrieval practice beats re-reading (see `references/study_method_canon.md`).

---

**Chapter**: ___  **Title**: ______________________  **Date**: __________
**Time spent**: ______  **Read as**: ☐ first pass ☐ working the derivations ☐ revisit

## 1. Core idea, in one sentence

> If this takes more than two sentences, you have summarized rather than extracted.

_______________________________________________________________________________

## 2. Three concepts I could define to someone else

1. _____________________________________________________________________________
2. _____________________________________________________________________________
3. _____________________________________________________________________________

## 3. One thing I could not follow

> Name it precisely — "the derivation on the negative phase" beats "the math."

_______________________________________________________________________________

**Is it blocking?** ☐ yes, a later chapter needs it (which: ____) ☐ no, note and move on

## 4. Self-explanation prompt

Pick one equation. **What breaks if this term is removed?**

_______________________________________________________________________________

## 5. When would I actually use this?

> A note that answers this gets read again. A note that restates the text does not.

_______________________________________________________________________________

## 6. Still true in 2026?

Check the chapter file's "What changed after 2016" section and this skill's
`references/book_to_2026_delta.md`.

☐ holds as written ☐ analysis holds, recommendation superseded ☐ historical only

What replaced it: ___________________________________________________________

## 7. The small thing I applied before moving on

> Five lines of code, one diagnosis of a real run, one re-derivation. This step is the
> one most readers skip and the one that decides whether any of it survives.

_______________________________________________________________________________

## 8. Revisit date

☐ +1 week: ________  ☐ +1 month: ________ (ch05, ch08, ch11 and ch18 are worth both)
