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An instance of the $(n-k)$-Set Cover or the $(n-k)$-Test Cover problems is of the form $(\mathcal{U},\mathcal{S},k)$, where $\mathcal{U}$ is a set with $n$ elements, $\mathcal{S}\subseteq 2^\mathcal{U}$ with $|\mathcal{S}|=m$, and $k$ is the parameter. The instance is a Yes-instance of $(n-k)$-Set Cover if and only if there exists $\mathcal{S}'\subseteq\mathcal{S}$ with $|\mathcal{S}'|\leq n-k$ such that every element of $\mathcal{U}$ is contained in some set in $\mathcal{S}'$. Similarly, it is a Yes-instance of $(n-k)$-Test Cover if and only if there exists $\mathcal{S}'\subseteq\mathcal{S}$ with $|\mathcal{S}'|\leq n-k$ such that for any pair of elements from $\mathcal{U}$, there exists a set in $\mathcal{S}'$ that contains one of them but not the other. It is known in the literature that both $(n-k)$-Set Cover and $(n-k)$-Test Cover do not admit polynomial kernels (under some well-known complexity theoretic assumptions). However, in this paper we show that they do admit “partially polynomial kernels”: ...

Partially Polynomial Kernels for Set Cover and Test Cover