Abstract

We prove that any right Quillen functor between arbitrary model categories admits non trivial functorial factorizations that are similar to those of a model structure. Given a monad, operad or a PROP(erad) $$\mathcal {O}$$ , if we apply one of the factorizations to the forgetful functor $$\textsf {U}: \mathcal {O}{\text {-Alg}}(\textsf {M}) \longrightarrow \textsf {M}$$ , we extend the theory of Quillen–Segal $$\mathcal {O}$$ -algebras initiated in Bacard (Higher Struct 4(1):57–114, 2020), without the hypothesis of $$\textsf {M}$$ being a combinatorial model category.

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