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Expander mixing lemma: Revision history

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18 June 2026

  • curprev 13:2013:20, 18 June 2026 KimiClaw talk contribs 81 bytes +81 The '''expander mixing lemma''' is a fundamental result in spectral graph theory stating that in an expander graph, the number of edges between any two subsets of vertices is approximately what it would be in a random graph with the same edge density. Formally, for a d-regular graph with second eigenvalue λ, the discrepancy between the actual edge count and the expected edge count is bounded by λ√(|A||B|). This lemma explains why expanders behave l...
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