Semiprojectivity and properly infinite projections in graph C-algebras

Søren Eilers, Takeshi Katsura

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We give a complete description of which unital graph C-algebras are semiprojective, and use it to disprove two conjectures by Blackadar. To do so, we perform a detailed analysis of which projections are properly infinite in such C-algebras.

Original languageEnglish
Pages (from-to)108-156
Number of pages49
JournalAdvances in Mathematics
Publication statusPublished - 2017 Sept 7


  • Graph C-algebras
  • Properly infinite projections
  • Semiprojectivity

ASJC Scopus subject areas

  • Mathematics(all)


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