On equivariant rational homotopy theory:
Introducing the model structure on equivariant dgc-algebras, generalizing the projective model structure on dgc-algebras to equivariant rational homotopy theory, such that equivariant minimal Sullivan models are cofibrant objects, and proving the fundamental theorem of dg-algebraic equivariant rational homotopy theory:
On certain pushouts (amalgamations) in the 1-category Cat of small categories:
On orbifold cohomology (such as orbifold K-theory):
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