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Expander code

Type of error-correcting codes

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General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionSep 22, 2026
Entity authoritySource title only
Source-derived summary

In coding theory, expander codes form a class of error-correcting codes that are constructed from bipartite expander graphs.

Along with Justesen codes, expander codes are of particular interest since they have a constant positive rate, positive relative distance, and alphabet size.

In fact, the alphabet contains only two elements, so expander codes belong to the class of binary codes.

Furthermore, expander codes can be both encoded and decoded in time proportional to the block length of the code.

Editorial summary

The public source identifies “Expander code” as type of error-correcting codes. This brief keeps that definition visible, then builds a research path around Expander, code and Type.

Editorial reviewA dependable orientation record for establishing vocabulary, names and a first evidence trail. The current 78-word lead offers orientation but no explicit four-digit date, so chronology should not be assumed. The selected authority fields contribute no independent date. Its value is orientation rather than verdict, with Expander, code and Type providing the first useful test.
Editorial analysis

Why this record matters

A short description can identify a subject without explaining its stakes. For “Expander code”, the useful work is to connect “type of error-correcting codes” to the records capable of establishing context and consequence.

Evidence profile

Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 22, 2026.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

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  1. Establish the record: confirm the title “Expander code”, its source revision and the description used here.
  2. Expand the search: follow Expander code primary sources, Expander code archive and Expander research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

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Source & attribution

This entry incorporates text from “Expander code” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.