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. We provide a characterization of classes of filters $\mathbb{D}$for which the full subcategory $\operatorname{fix}\operatorname{A}_{\mathbb D}$of $\mathsf{Conv}$ formed by convergences determined by the adherence offilters of the class $\mathbb{D}$ is simple in $\mathsf{Conv}$. Along the way,we also elucidate when two classes of filters result in the same category ofadherence-determined convergences. As an application of the main result, weshow that the category of hypotopologies is not simple, thus answering aquestion from [25].

When is a category of adherence-determined convergences simple?