The Sequences / Rationality: A–Z
Dated sources are over 18 months old; other dates are unknown.
Publication dates and source age
Sources counted: 2
Newest dated source: 2019-06-01
Assessed at this edition's evidence cutoff: 2026-09-15. 18-month boundary: 2025-03-15.
Some publication dates are unknown; the newest dated source may not be the newest source overall.
Publication age does not tell us whether a claim is still valid. Reading an old source again does not make its publication date newer. An update date does not establish that the passage we used was updated.
Open in the glossary Reading notes · Structured record
In plain language
Eliezer Yudkowsky's linked essays about reasoning, which helped shape the vocabulary used on LessWrong. [1]
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Limits & distinctions
A community's introductory canon is different from a scientific consensus. Individual claims still need scrutiny. [2]
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A fuller explanation
Eliezer Yudkowsky's linked essays on reasoning and related topics, originally blog posts and later edited into Rationality: A–Z. They helped seed LessWrong's shared vocabulary. [1]
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How it relates to the map
Background reading for this intellectual community, not an actor or AI policy platform. [2]
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https://theaiatlas.org/ideas/sequences/
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Image previews are summaries. Keep the page link so readers can check the evidence.
Sources and what we read
1. A Brief History of LessWrong
Source is over 18 months old.
Publication dates and source age
Sources counted: 1
Newest dated source: 2019-06-01
Assessed at this edition's evidence cutoff: 2026-09-15. 18-month boundary: 2025-03-15.
Publication age does not tell us whether a claim is still valid. Reading an old source again does not make its publication date newer. An update date does not establish that the passage we used was updated.
Read the site's own retrospective: Overcoming Bias in 2006, LessWrong in 2009, and the Sequences. An internal community account, not an independent history.
2. Welcome to LessWrong!
Publication dates and source age
Sources counted: 1
Publication dates are unavailable.
Assessed at this edition's evidence cutoff: 2026-09-15. 18-month boundary: 2025-03-15.
Some publication dates are unknown; the newest dated source may not be the newest source overall.
Publication age does not tell us whether a claim is still valid. Reading an old source again does not make its publication date newer. An update date does not establish that the passage we used was updated.
Read the site's introduction and intended reasoning practice. Self-description does not certify participants' accuracy or common beliefs.
Edition and machine-readable evidence
Content version 0.20.0. Evidence cutoff 2026-09-15; this does not mean every source was read on that day.
Pinned complete dataset · Complete evidence page · Agent consumption guide