This is the third installment in a series of editorials on the implications of open-access publishing for established publishing practices and stakeholders in scientifi c and medical research. T he questions, tensions, and social concerns surrounding copyright and the Internet are very different for scientifi c and medical literature than for other kinds of easily reproducible digital works. Pe...

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For an n-component link, Milnor’s isotopy invariants are defined for each multi-index I = i1i2...im (ij ∈ {1, ..., n}). Here m is called the length. Let r(I) denote the maximum number of times that any index appears in I. It is known that Milnor invariants with r = 1, i.e., Milnor invariants for all multi-indices I with r(I) = 1, are link-homotopy invariant. N. Habegger and X. S. Lin showed tha...