Baer–Specker group
type: Thing
description: infinite Abelian group that is not free; the direct product of countably many copies of the infinite cyclic group
additional property: PropertyValue
  property ID: P31
  value: abelian group
additional property: PropertyValue
  property ID: P31
  value: infinite group
additional property: PropertyValue
  property ID: P138
  value: Reinhold Baer
additional property: PropertyValue
  property ID: P138
  value: Ernst Specker
additional property: PropertyValue
  property ID: P646
  value: /m/04ljcps
additional property: PropertyValue
  property ID: P6366
  value: 2778953623
additional property: PropertyValue
  property ID: P8417
  value: Baer-Specker_group
confidence:
  popularity graph score:
    score: 0.0
    score pct: 0
    tier: long_tail
    components:
      sitelinks: 0
      sitelinks norm: 0.0
      unique citations: 0
      unique citations norm: 0.0
      monthly pageviews: 34
      monthly pageviews norm: 0.0
  sitelinks: 0
  unique citations: 0
  monthly pageviews: 34
  yearly pageviews: 57
  pageview trend:
    m: 2026-08
    v: 34
  pageview trend:
    m: 2026-07
    v: 7
  pageview trend:
    m: 2026-06
    v: 12
  pageview trend:
    m: 2026-05
    v: 4
  tier: long_tail
claims:
  P31:
    value: Q181296
    source count: 0
    confidence: 0.0
    value label: abelian group
  P31:
    value: Q374268
    source count: 0
    confidence: 0.0
    value label: infinite group
  P138:
    value: Q78085
    source count: 0
    confidence: 0.0
    value label: Reinhold Baer
  P138:
    value: Q117486
    source count: 0
    confidence: 0.0
    value label: Ernst Specker
  P646:
    value: /m/04ljcps
    source count: 0
    confidence: 0.0
  P6366:
    value: 2778953623
    source count: 0
    confidence: 0.0
  P8417:
    value: Baer-Specker_group
    source count: 0
    confidence: 0.0
meta:
  wikidata id: Q4841300
  domain: abelian_group
  level: standard
  html url: https://4ort.xyz/entity/baer-specker-group
  markdown url: https://4ort.xyz/entity/baer-specker-group.md
  facts url summary: https://4ort.xyz/entity/baer-specker-group/facts.json
  facts url standard: https://4ort.xyz/entity/baer-specker-group/facts.json
  facts url full: https://4ort.xyz/entity/baer-specker-group/facts.json
  data source: Wikidata (CC0 / public domain)
  license: https://creativecommons.org/publicdomain/zero/1.0/
  api version: v1
  served at: 2026-08-26T01:44:33.259393Z
  entity updated at: 2026-05-03T23:45:09.469384+00:00Z
  entity created at: 2026-05-03T13:44:26.921445+00:00Z