Ramanujan graph

noun

A regular graph whose spectral gap is almost as large as possible, making it an excellent spectral expander. Such graphs are relevant to diverse branches of pure mathematics.

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Meanings

nounRamanujan graph (plural Ramanujan graphs)

plural Ramanujan graphs

  1. graph theoryA regular graph whose spectral gap is almost as large as possible, making it an excellent spectral expander. Such graphs are relevant to diverse branches of pure mathematics.

Origin

Named after mathematician Srinivasa Ramanujan.

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Cite this entry
APA

Ramanujan graph. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Ramanujan%20graph

MLA

“Ramanujan graph.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Ramanujan%20graph. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Ramanujan graph,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Ramanujan%20graph.

Source: Ramanujan graph on Wiktionary, CC BY-SA 4.0.