Shrinkability, relative left properness, and derived base change

Philip Hackney*, Marcy Robertson, Donald Yau

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


For a connected pasting scheme G, under reasonable assumptions on the underlying category, the category of C-colored G-props admits a cofibrantly generated model category structure. In this paper, we show that, if G is closed under shrinking internal edges, then this model structure on G-props satisfies a (weaker version) of left properness. Connected pasting schemes satisfying this property include those for all connected wheeled graphs (for wheeled properads), wheeled trees (for wheeled operads), simply connected graphs (for dioperads), unital trees (for symmetric operads), and unitial linear graphs (for small categories). The pasting scheme for connected wheel-free graphs (for properads) does not satisfy this condition.

We furthermore prove, assuming G is shrinkable and our base categories are nice enough, that a weak symmetric monoidal Quillen equivalence between two base categories induces a Quillen equivalence between their categories of c-props. The final section gives illuminating examples that justify the conditions on base model categories.

Original languageEnglish
Pages (from-to)83-117
Number of pages35
JournalNew York Journal of Mathematics
Publication statusPublished - 2017
Externally publishedYes


  • Wheeled properads
  • operads
  • dioperads
  • model categories
  • left proper


Dive into the research topics of 'Shrinkability, relative left properness, and derived base change'. Together they form a unique fingerprint.

Cite this