Extending curvature to all submodular functions yields the first multiplicative greedy approximation guarantees that apply even when the function takes negative values.
Submodular maximization with car- dinality constraints
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Curvature Beyond Positivity: Greedy Guarantees for Arbitrary Submodular Functions
Extending curvature to all submodular functions yields the first multiplicative greedy approximation guarantees that apply even when the function takes negative values.