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In multiple-instance learning the learner receives bags, i.e., sets of instances. A bag is labeled positive if it contains a positive example of the target. An Ω(d log r) lower bound is given for the VC-dimension of bags of size r for d-dimensional halfspaces and it is shown that the same lower bound holds for halfspaces over any large point set in general position. This lower bound improves an Ω(log r) lower bound of Sabato and Tishby, and it is sharp in order of magnitude. We also show thatdoi:10.1016/j.ipl.2012.08.017 fatcat:b2qodm6j2vazblmzmd53arwk64