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direct sum

operation in abstract algebra composing objects into "more complicated" objects
Thing general Q13582243
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direct sum

Summary

direct sum ranks in the top 2% of general entities by monthly Wikipedia readership (290 views/month).[1]

Key Facts

  • direct sum's subclass of is recorded as mathematical operation[2].
  • direct sum's Freebase ID is recorded as /m/0b74nq0[3].
  • direct sum's defining formula is recorded as (a_1, b_1) \cdot (a_2, b_2) = (a_1 \circ a_2, b_1 \bullet b_2)[4].
  • direct sum's MathWorld ID is recorded as DirectSum[5].
  • direct sum's maintained by WikiProject is recorded as WikiProject Mathematics[6].
  • direct sum's Microsoft Academic ID is recorded as 207944066[7].

Why It Matters

direct sum ranks in the top 2% of general entities by monthly Wikipedia readership (290 views/month).[1] It has Wikipedia articles in 8 language editions, a strong signal of global cultural recognition.[8] It is known by 5 alternative names across languages and contexts.[9]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [8] ↑ . Wikidata sitelinks. wikidata.org.
  3. [9] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). direct sum. Retrieved April 10, 2026, from https://4ort.xyz/entity/direct-sum
MLA “direct sum.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/direct-sum.
BibTeX @misc{4ortxyz_direct-sum_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{direct sum}}, year = {2026}, url = {https://4ort.xyz/entity/direct-sum}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): direct sum — https://4ort.xyz/entity/direct-sum (retrieved 2026-04-10)

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