Abstract
In a recent paper, Felderhof 1 developed a simplified model of swimming beads subject to one-body forces and held together by two-body forces. One important conclusion the author draws from the analysis is that a two-bead system, where beads do not rotate or change their size, is incapable of swimming. The goal of this Comment is to demonstrate that this statement is erroneous. An example of a two-bead model system that swims while satisfying conditions imposed by Felderhof is provided here to illustrate the error. Felderhof’s notation is employed here for the sake of continuity of exposition. In the case of two beads, the model system is described by equations u1 = 1K 1 + T rK 2, u2 = T rK 1 + 2K 2,
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