In this chapter, we recall the definition of the category of 𝛴*-objects and we review the relationship between 𝛴-objects and functors. In short, a 𝛴_-object (in English words, a symmetric sequence of objects, or simply a symmetric object) is the coefficient sequence of a generalized symmetric functor S(M):X→S(M,X), defined by a formula of the form S(M,X)= bigoplus  ᪲ᵣ₌₀(M(r)⊗X)_(𝛴ᵣ).

But one or two evil-disposed characters muttered they might be sure the lady had her own turn to serve, and they might be sure they wasn’t “teaed and muffined and sandwiched for nothing!”

If you care about your reputation you ought to be careful whom you keep company with.

Pretreatment of oil or sea water with dispersants or demulsifiers generally inhibits laboratory mousse formation with most of the oils and petroleum products tested (Berridge et al. , 1968b; Bridie et al. , 1980a,b).