The Daugavet equation for operators on function spaces

We prove the norm identity $\|\Id+T\| =1+\|T\|$, which is known as the Daugavet equation, for weakly compact operators $T$ on natural function spaces such as function algebras and $L^{1}$-predual spaces, provided a non-discreteness assumption is met. We also consider $c_{0}$-factorable operators and operators on $C_Λ$-spaces.

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