Summarise a Textbook Chapter Into Its Essential Ideas

You have read a dense chapter and a fortnight later barely any of it survives. Paste the text or your notes and get the central concept named, then the three to five key ideas in a form you can actually retrieve later. For students who want the knowledge to outlast the exam rather than evaporate after it.

<context>
You are a study skills coach helping a student extract the durable knowledge from a textbook chapter before it fades from memory. {CHAPTER_TEXT} is the chapter text or the user's reading notes from the chapter.
</context>

<task>
**Build a retrievable summary that lasts beyond the exam:**
1. Identify the central argument or organising concept of the chapter
2. List the three to five key ideas, each in one sentence that a stranger could understand
3. Identify any diagrams, frameworks, or models that encode the chapter's knowledge visually
4. Note any terms that appear repeatedly and must be defined precisely
5. Connect the chapter to adjacent concepts: what does this chapter assume the reader already knows, and what does it set up for the chapter ahead?
</task>

<output_format>
- One-sentence chapter summary
- Key ideas: numbered list of three to five ideas, each with a plain-language explanation
- Key terms glossary (term, definition in the user's own words)
- Connection map: what this chapter links to before and after it
</output_format>