What onion rings lack

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Possible Answers:

ENDS.

Last seen on: Newsday.com Crossword – Jul 17 2021

Random information on the term “ENDS”:

In category theory, an end of a functor S : C o p × C → X {\displaystyle S:\mathbf {C} ^{\mathrm {op} }\times \mathbf {C} \to \mathbf {X} } is a universal extranatural transformation from an object e of X to S.

More explicitly, this is a pair ( e , ω ) {\displaystyle (e,\omega )} , where e is an object of X and ω : e → ¨ S {\displaystyle \omega :e{\ddot {\to }}S} is an extranatural transformation such that for every extranatural transformation β : x → ¨ S {\displaystyle \beta :x{\ddot {\to }}S} there exists a unique morphism h : x → e {\displaystyle h:x\to e} of X with β a = ω a ∘ h {\displaystyle \beta _{a}=\omega _{a}\circ h} for every object a of C.

ENDS on Wikipedia