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# edu-18qe
title: 'Markov lesson: What Is a Markov Chain?'
status: completed
type: task
priority: high
created_at: 2026-03-10T23:30:02Z
updated_at: 2026-03-10T23:30:02Z
---
Write Section 1 of edu/markov.md: 'What Is a Markov Chain?'\n\nLearning objectives:\n- Define the Markov property (memorylessness)\n- Give 3–4 concrete real-world examples (weather, board games, web surfing, genetics)\n- Explain why the Markov property is a useful modelling assumption\n- Introduce the notation P(Xₙ₊₁ = s | X₀, …, Xₙ) = P(Xₙ₊₁ = s | Xₙ)\n\nContent to produce:\n- 3–5 paragraphs of prose\n- At least one illustrative example worked through informally\n- No code in this section\n\nTarget: replace the stub in edu/markov.md §1